Codelists
**************


.. _EPSG:

EPSG Registry
=====================

Refer to the official EPSG Geodetic Parameter Dataset of coordinate reference systems and transformations. Refer to `https://www.epsg-registry.org/ <https://www.epsg-registry.org/>`_ for further details.


.. _MD_MetadataScopeCode:

MD_MetadataScopeCode
===========================

A reduced version of MD_ScopeCode.

+--------------------+--------------------------------------------------------------------------------+
|Element name        |Element description                                                             |
+====================+================================================================================+
|dataset             |information applies to the dataset                                              |
+--------------------+--------------------------------------------------------------------------------+
|series              |information applies to the entire dataset series                                |
+--------------------+--------------------------------------------------------------------------------+
|nonGeographicDataset|information applies to only non-geographic data                                 |
+--------------------+--------------------------------------------------------------------------------+
|software            |information applies to a computer program or routine                            |
+--------------------+--------------------------------------------------------------------------------+
|model               |information applies to a copy or imitation of an existing or hypothetical object|
+--------------------+--------------------------------------------------------------------------------+
|initiative          |information applies to an initiative                                            |
+--------------------+--------------------------------------------------------------------------------+
|sample              |information applies to a single sample                                          |
+--------------------+--------------------------------------------------------------------------------+
|aggregate           |information applies to an aggregate resource                                    |
+--------------------+--------------------------------------------------------------------------------+


.. _MD_ProgressCode:

MD_ProgressCode
======================

+-----------------+------------------------------------------------------------------------------------+
|Element name     |Element description                                                                 |
+=================+====================================================================================+
|completed        |production of the data has been completed                                           |
+-----------------+------------------------------------------------------------------------------------+
|historicalArchive|data has been stored in an *offline* storage facility                               |
+-----------------+------------------------------------------------------------------------------------+
|obsolete         |data is no longer relevant                                                          |
+-----------------+------------------------------------------------------------------------------------+
|onGoing          |data is continually being updated                                                   |
+-----------------+------------------------------------------------------------------------------------+
|planned          |fixed date has been established upon or by which the data will be created or updated|
+-----------------+------------------------------------------------------------------------------------+
|required         |data needs to be generated or updated                                               |
+-----------------+------------------------------------------------------------------------------------+
|underDevelopment |data is currently in the process of being created                                   |
+-----------------+------------------------------------------------------------------------------------+
|final            |progress concluded and no changes will be accepted                                  |
+-----------------+------------------------------------------------------------------------------------+
|pending          |committed to, but not yet addressed                                                 |
+-----------------+------------------------------------------------------------------------------------+
|retired          |item is no longer recommended for use. It has not been superseded by another item   |
+-----------------+------------------------------------------------------------------------------------+
|superseded       |replaced by new document                                                            |
+-----------------+------------------------------------------------------------------------------------+
|tentative        |provisional changes likely before resource becomes final or complete                |
+-----------------+------------------------------------------------------------------------------------+
|valid            |acceptable under specific conditions                                                |
+-----------------+------------------------------------------------------------------------------------+
|accepted         |agreed to by sponsor                                                                |
+-----------------+------------------------------------------------------------------------------------+
|notAccepted      |rejected by sponsor                                                                 |
+-----------------+------------------------------------------------------------------------------------+
|withdrawn        |removed from consideration (generally implies data problems beyond obsolence)       |
+-----------------+------------------------------------------------------------------------------------+
|proposed         |suggested that development needs to be undertaken                                   |
+-----------------+------------------------------------------------------------------------------------+
|deprecated       |resource superseded and will become obsolete, use only for historical purposes      |
+-----------------+------------------------------------------------------------------------------------+



.. _ISO639:

ISO 639-2 three letter language code
=============================================

Refer to `this Library of Congress page on ISO 639-2 for a complete list sorted by English language name <http://www.loc.gov/standards/iso639-2/php/English_list.php>`_, 
and to `this page for a list sorted by the three letter code <https://www.loc.gov/standards/iso639-2/php/code_list.php>`_.


.. _ISO3166:

ISO 3166-1 three letter country code
=============================================

Refer to `the Wikipedia page on ISO 3166-1 alpha-3 <https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3>`_ for a list of current 3166-1 three letter country codes.

.. _MD_CharacterSetCode:

MD_CharacterSetCode
==========================

+------------+---------------------------------------------------------------------------------------------------------------------------------+
|Element name|Element description                                                                                                              |
+============+=================================================================================================================================+
|ucs2        |16-bit fixed size Universal Character Set, based on ISO/IEC 10646                                                                |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|ucs4        |32-bit fixed size Universal Character Set, based on ISO/IEC 10646                                                                |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|utf7        |7-bit variable size UCS Transfer Format, based on ISO/IEC 10646                                                                  |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|utf8        |8-bit variable size UCS Transfer Format, based on ISO/IEC 10646. The default.                                                    |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|utf16       |16-bit variable size UCS Transfer Format, based on ISO/IEC 10646                                                                 |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part1   |ISO/IEC 8859-1, Information technology - 8-bit single byte coded graphic character sets - Part 1 : Latin alphabet No.1           |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part2   |ISO/IEC 8859-2, Information technology - 8-bit single byte coded graphic character sets - Part 2 : Latin alphabet No.2           |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part3   |ISO/IEC 8859-3, Information technology - 8-bit single byte coded graphic character sets - Part 3 : Latin alphabet No.3           |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part4   |ISO/IEC 8859-4, Information technology - 8-bit single byte coded graphic character sets - Part 4 : Latin alphabet No.4           |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part5   |ISO/IEC 8859-5, Information technology - 8-bit single byte coded graphic character sets - Part 5 : Latin/Cyrillic alphabet       |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part6   |ISO/IEC 8859-6, Information technology - 8-bit single byte coded graphic character sets - Part 6 : Latin/Arabic alphabet         |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part7   |ISO/IEC 8859-7, Information technology - 8-bit single byte coded graphic character sets - Part 7 : Latin/Greek alphabet          |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part8   |ISO/IEC 8859-8, Information technology - 8-bit single byte coded graphic character sets - Part 8 : Latin/Hebrew alphabet         |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part9   |ISO/IEC 8859-9, Information technology - 8-bit single byte coded graphic character sets - Part 9 : Latin alphabet No.5           |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part10  |ISO/IEC 8859-10, Information technology - 8-bit single byte coded graphic character sets - Part 10 : Latin alphabet No.6         |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part11  |ISO/IEC 8859-11, Information technology - 8-bit single byte coded graphic character sets - Part 11 : Latin/Thai alphabet         |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part13  |ISO/IEC 8859-13, Information technology - 8-bit single byte coded graphic character sets - Part 13 : Latin alphabet No.7         |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part14  |ISO/IEC 8859-14, Information technology - 8-bit single byte coded graphic character sets - Part 14 : Latin alphabet No.8 (Celtic)|
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part15  |ISO/IEC 8859-15, Information technology - 8-bit single byte coded graphic character sets - Part 15 : Latin alphabet No.9         |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|8859part16  |ISO/IEC 8859-16, Information technology - 8-bit single byte coded graphic character sets - Part 16 : Latin alphabet No.10        |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|jis         |Japanese code set used for electronic transmission                                                                               |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|shiftJIS    |Japanese code set used on MS-DOS machines                                                                                        |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|eucJP       |Japanese code set used on UNIX based machines                                                                                    |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|usAscii     |United States ASCII code set (ISO 646 US)                                                                                        |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|ebcdic      |IBM mainframe code set                                                                                                           |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|eucKR       |Korean code set                                                                                                                  |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|big5        |traditional Chinese code set used in Taiwan, Hong Kong of China and other areas                                                  |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|GB2312      |simplified Chinese code set                                                                                                      |
+------------+---------------------------------------------------------------------------------------------------------------------------------+
|Windows-1252|Windows-specific extension of ISO/IEC 8859-1. Includes additional special characters.                                            |
+------------+---------------------------------------------------------------------------------------------------------------------------------+

.. _MD_CoverageContentTypeCode:

MD_CoverageContentTypeCode
==================================

+----------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name          |Element description                                                                                                                                                                                                                     |
+======================+========================================================================================================================================================================================================================================+
|image                 |meaningful numerical representation of a physical parameter that is not the actual value of the physical parameter                                                                                                                      |
+----------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|thematicClassification|code value with no quantitative meaning, used to represent a physical quantity                                                                                                                                                          |
+----------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|physicalMeasurement   |value in physical units of the quantity being measured                                                                                                                                                                                  |
+----------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


.. _MD_TopicCategoryCode:

MD_TopicCategoryCode
===========================

+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name                    |Element description                                                                                                                                                                                                                                                                                                                     |
+================================+========================================================================================================================================================================================================================================================================================================================================+
|farming                         |rearing of animals and/or cultivation of plants. Examples: agriculture, irrigation, aquaculture, plantations, herding, pests and diseases affecting crops and livestock                                                                                                                                                                 |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|biota                           |flora and/or fauna in natural environment. Examples: wildlife, vegetation, biological sciences, ecology, wilderness, sealife, wetlands, habitat                                                                                                                                                                                         |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|boundaries                      |legal land descriptions. Examples: political and administrative boundaries                                                                                                                                                                                                                                                              |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|climatologyMeteorologyAtmosphere|processes and phenomena of the atmosphere. Examples: cloud cover, weather, climate, atmospheric conditions, climate change, precipitation                                                                                                                                                                                               |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|economy                         |economic activities, conditions and employment. Examples: production, labour, revenue, commerce, industry, tourism and ecotourism, forestry, fisheries, commercial or subsistence hunting, exploration and exploitation of resources such as minerals, oil and gas                                                                      |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|elevation                       |height above or below sea level. Examples: altitude, bathymetry, digital elevation models, slope, derived products                                                                                                                                                                                                                      |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|environment                     |environmental resources, protection and conservation. Examples: environmental pollution, waste storage and treatment, environmental impact assessment, monitoring environmental risk, nature reserves, landscape                                                                                                                        |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|geoscientificInformation        |information pertaining to earth sciences. Examples: geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, erosion                         |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|health                          |health, health services, human ecology, and safety. Examples: disease and illness, factors affecting health, hygiene, substance abuse, mental and physical health, health services                                                                                                                                                      |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|imageryBaseMapsEarthCover       |base maps. Examples: land cover, topographic maps, imagery, unclassified images, annotations                                                                                                                                                                                                                                            |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|intelligenceMilitary            |military bases, structures, activities. Examples: barracks, training grounds, military transportation, information collection                                                                                                                                                                                                           |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|inlandWaters                    |inland water features, drainage systems and their characteristics. Examples: rivers and glaciers, salt lakes, water utilization plans, dams, currents, floods, water quality, hydrographic charts                                                                                                                                       |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|location                        |positional information and services. Examples: addresses, geodetic networks, control points, postal zones and services, place names                                                                                                                                                                                                     |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|oceans                          |features and characteristics of salt water bodies (excluding inland waters). Examples: tides, tidal waves, coastal information, reefs.                                                                                                                                                                                                  |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|planningCadastre                |information used for appropriate actions for future use of the land. Examples: land use maps, zoning maps, cadastral surveys, land ownership                                                                                                                                                                                            |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|society                         |characteristics of society and cultures. Examples: settlements, anthropology, archaeology, education, traditional beliefs, manners and customs, demographic data, recreational areas and activities, social impact assessments, crime and justice, census information                                                                   |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|structure                       |man-made construction. Examples: buildings, museums, churches, factories, housing, monuments, shops, towers                                                                                                                                                                                                                             |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|transportation                  |means and aids for conveying persons and/or goods. Examples: roads, airports/airstrips, shipping routes, tunnels, nautical charts, vehicle or vessel location, aeronautical charts, railways                                                                                                                                            |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|utilitiesCommunication          |energy, water and waste systems and communications infrastructure and services. Examples: hydroelectricity, geothermal, solar and nuclear sources of energy, water purification and distribution, sewage collection and disposal, electricity and gas distribution, data communication, telecommunication, radio, communication networks|
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|extraTerrestrial                |region more than 100 km above the surface of the Earth                                                                                                                                                                                                                                                                                  |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|disaster                        |Information related to disasters. Examples: site of the disaster, evacuation zone, disaster-prevention facility, disaster relief activities                                                                                                                                                                                             |
+--------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


.. _SeavoxPlatforms:

SeaVoX platform types
===========================

+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name                         |Element description                                                                                                                                                                                                                                    |
+=====================================+=======================================================================================================================================================================================================================================================+
|Unknown                              |The correct value is not known to, and not computable by, the creator of this information. However, a correct value probably exists.                                                                                                                   |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Land or seafloor                     |A platform located on the solid surface of the Earth either above or below sea level.                                                                                                                                                                  |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Fixed benthic node                   |A collection of oceanographic instruments mounted at a fixed position on the seabed (e.g. POL Monitoring Platform, seabed ADCP).                                                                                                                       |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sea bed vehicle                      |An instrumented platform that is propelled on wheels or tracks on the seabed (e.g benthic crawler).                                                                                                                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Beach/intertidal zone structure      |A structure to which instrumentation may be attached that is either in air or under water depending on the state of the tide and weather conditions.                                                                                                   |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Land/onshore structure               |A fixed man-made structure on land to which instrumentation may be attached (e.g. meteorological tower).                                                                                                                                               |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Land/onshore vehicle                 |An instrumented vehicle or sample collector that operates on the solid surface of the Earth (e.g. mobile meteorological station, land crawler, snowmobile).                                                                                            |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Offshore structure                   |A fixed (for the duration of the measurements) man-made structure away from the coast to which instrumentation may be attached (e.g. oil rig, gas rig or jack-up barge).                                                                               |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Coastal structure                    |A fixed man-made structure permanently linked to land with access to water at all states of the tide to which instrumentation may be attached (e.g. pier).                                                                                             |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|River station                        |An instrumented structure in a river upstream of its tidal limit.                                                                                                                                                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Mesocosm bag                         |A large polythene bag containing a water sample suspended in the natural environment so that it shares ambient physical conditions such as temperature and light levels, but is chemically isolated to allow experiments such as fertilization.        |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Submersible                          |A platform operating within a water body.                                                                                                                                                                                                              |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Propelled manned submersible         |A platform operating in the water column that has both self-contained propulsion and at least one human operator on board (e.g. submarine).                                                                                                            |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Propelled unmanned submersible       |A platform operating in the water column attached to a mothership by an umbilical with limited propulsion and no human operator on board (e.g. ROV).                                                                                                   |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Towed unmanned submersible           |A vehicle towed by rigid cable through the water column at fixed or varying depth with no propulsion and no human operator (e.g. Towfish, Scanfish, UOR, SeaSoar).                                                                                     |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Drifting manned submersible          |A platform operating in the water column attached to a mothership by an umbilical but with no means of propulsion that has at least one human operator on board (e.g. bathysphere).                                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Autonomous underwater submersible    |A free-roving platform operating in the water column with propulsion but no human operator on board (e.g. Autosub, Glider).                                                                                                                            |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Lowered unmanned submersible         |An unmanned platform lowered and raised vertically by a cable from the mothership.  Includes any type of profiling sensor mounting such as CTD frames, profiling radiometers and instrumented nets.                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sub-surface gliders                  |Platforms with buoyancy-based propulsion that are capable of operations at variable depths which are not constrained to be near the sea surface.                                                                                                       |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Ship                                 |A large platform operating on the surface of the water column. Objective definitions for guidelines: >50m length (EU), >100 foot length (USA), >300 GRT weight (SOLAS). Subjective definition: a ship is a vessel big enough to carry a boat.          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Research vessel                      |A platform of any size operating on the surface of the water column in unpredictable locations that is specifically equipped, manned and operated for scientific, usually oceanographic, research.                                                     |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Vessel of opportunity                |A platform for purpose of commerce of any size operating on the surface of the water column in unpredictable locations that regularly collects scientific (oceanographic and meteorological) data (e.g. an instrumented cargo vessel).                 |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Self-propelled small boat            |A small self-propelled platform operating on the surface of the water column that may be easily removed from the water (e.g. shore-based RIBs, ships' boats).                                                                                          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Vessel at fixed position             |A platform of any size occupying a fixed location on the surface of the water column for prolonged periods collecting scientific (oceanographic and meteorological) data as a primary or secondary mission.  Includes light vessels and weather ships. |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Vessel of opportunity on fixed route |A platform repeatedly following a predictable fixed track on the surface of the water column that collects scientific (oceanographic and meteorological) data (e.g. an instrumented ferry).                                                            |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Fishing vessel                       |A platform operating on the surface of the water column whose primary purpose is the commercial harvesting of fish or shellfish but may be engaged in scientific activities such as fish stock surveys or mooring deployments and recoveries.          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Self-propelled boat                  |A small self-propelled platform operating on the surface of the water column in unpredictable locations that is smaller than a ship, but too large to easily remove from the water.                                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Man-powered boat                     |A platform operating on the surface of the water column that is manually propelled and may not be easily removed from the water (e.g. trireme).                                                                                                        |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Naval vessel                         |A platform operating on the surface of the water column in unpredictable locations that is primarily equipped, manned and operated for military purposes.  Includes surface warships of all sizes and logistic support vessels.                        |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Man-powered small boat               |A platform operating on the surface of the water column that is manually propelled and may be easily removed from the water (e.g. rowing boat, canoe).                                                                                                 |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Autonomous surface water vehicle     |A self-propelled vehicle operating on the sea surface with no human occupants.                                                                                                                                                                         |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Surface gliders                      |Platforms operating at a single depth near the sea surface, using a combination of solar energy and wave motion as means of propulsion.                                                                                                                |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Drillship                            |A drillship is a merchant vessel designed for use in exploratory offshore drilling of new oil and gas wells or for scientific drilling purposes.                                                                                                       |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Surface vessel                       |A mobile platform with propulsion operating on and restricted to the surface of a water body.                                                                                                                                                          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Moored surface buoy                  |An unmanned instrumented platform operating on the surface of the water column loosely tethered to the seafloor to maintain a fixed position (e.g. ODAS buoy).                                                                                         |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Drifting surface float               |An unmanned instrumented platform operating on the surface of the water column often attached to a drogue to track currents rather than winds (e.g. Argos buoy).                                                                                       |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Subsurface mooring                   |A collection of oceanographic instruments attached to wires suspended between anchors on the seabed and buoyant spheres in the water column.                                                                                                           |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Drifting subsurface float            |An unmanned instrumented platform drifting freely in the water column at a depth governed by its density (e.g. Swallow float).                                                                                                                         |     
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Fixed subsurface vertical profiler   |A platform that periodically makes an automated vertical traverse of the water column at a predetermined fixed location. (e.g. YSI vertical profiler, HOMER CTD).                                                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Drifting subsurface profiling float  |An unmanned instrumented platform drifting freely in the water column that periodically makes vertical traverses through the water column (e.g. Argo float).                                                                                           |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Float                                |A free-floating platform either on the surface of the water column or at a predetermined depth within the water column.                                                                                                                                |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Mooring                              |A tethered collection of oceanographic instruments at a fixed location that may include seafloor, mid-water and surface components.                                                                                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Surface ice buoy                     |An undrogued (i.e. no sub-surface parachute) surface float that is deployed in regions where sea ice forms that moves with either ice or water depending upon the time of year.                                                                        |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Buoyant aircraft                     |A platform capable of flight in the atmosphere because it is lighter than air.                                                                                                                                                                         |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Free-rising balloon                  |A container filled with a gas that is lighter than air, which is constrained to rise vertically at a fixed location.                                                                                                                                   |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Free-floating balloon                |A container filled with a gas that is lighter than air, which is free to drift in the atmosphere.                                                                                                                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Tethered balloon                     |A container filled with a gas that is lighter than air, which is tethered at a fixed height and location.                                                                                                                                              |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Airship                              |A self-propelled container filled with a gas that is lighter than air.                                                                                                                                                                                 |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Non-buoyant aircraft                 |A platform capable of flight in the atmosphere despite its being heavier than air.                                                                                                                                                                     |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Research aeroplane                   |A fixed-wing self-propelled aircraft that is equipped, manned and operated for atmospheric, meteorological or oceanographic research.                                                                                                                  |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Aeroplane                            |A fixed-wing self-propelled aircraft.                                                                                                                                                                                                                  |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Rocket                               |A rocket is a vehicle, missile or aircraft which obtains thrust by the reaction to the ejection of fast moving exhaust gas from within a rocket engine.                                                                                                |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Geostationary orbiting satellite     |A vehicle operating beyond the Earth's atmosphere without human occupants that orbits the Earth at the same rate as the Earth's rotation keeping it over a fixed location on the Earth's surface.                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Orbiting satellite                   |A vehicle operating beyond the Earth's atmosphere without human occupants that orbits the Earth at a different rate to the Earth's rotation so it moves over the Earth's surface.                                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Manned spacecraft                    |A vehicle operating beyond the Earth's atmosphere with human occupants.                                                                                                                                                                                |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Helicopter                           |An aircraft without wings that obtains its lift from the rotation of overhead blades.                                                                                                                                                                  |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Satellite                            |A vehicle operating beyond the Earth's atmosphere without human occupants that orbits the Earth.                                                                                                                                                       |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Autogyro                             |An aircraft without wings that obtains its lift from the rotation of overhead blades, but obtains forward populsion from a fixed propellor.                                                                                                            |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Glider                               |A fixed-wing aircraft with no propulsion.                                                                                                                                                                                                              |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Kite                                 |An aerofoil tethered to the ground held aloft by the wind.                                                                                                                                                                                             |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Parachute                            |A fabric sheet designed to slow the descent of an object through the atmosphere.                                                                                                                                                                       |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Unmanned aerial vehicle              |Any untethered heavier-than-air aircraft that is not occupied by people: may be a remotely piloted aircraft or an autonomous aircraft. Also referred to as a drone.                                                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Spacecraft                           |A platform operating beyond the Earth's atmosphere.                                                                                                                                                                                                    |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Organism                             |A living creature carrying instruments or collecting samples.                                                                                                                                                                                          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Human                                |A human being without specialised equipment operating on land or the surface of the water column.                                                                                                                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Diver                                |A human being with self-contained equipment or surface-connected suit enabling operation within the water column.                                                                                                                                      |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Flightless bird                      |A bird that is unable to fly with the ability to exist within the water column (e.g. penguin).                                                                                                                                                         |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Seabird and duck                     |A flighted bird that is able to exist on the water column surface and dive into the water column (e.g. cormorants, auks, ducks and gulls).                                                                                                             |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Cetacean                             |A mammal that exists within the water column but needing to regularly surface to breathe (i.e. dolphins and whales).                                                                                                                                   |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Fish                                 |A free-swimming creature that exists totally within the water column.                                                                                                                                                                                  |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Land-sea mammals                     |A mammal that exists both on land and within the water column. Includes seals, sea-lions, sea-otters and walruses.                                                                                                                                     |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Cryosphere                           |A frozen body of water on land, freshwater or sea.                                                                                                                                                                                                     |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Ice island                           |A floating ice sheet detached from the coast.                                                                                                                                                                                                          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Ice shelf                            |A floating ice sheet attached to the coast.                                                                                                                                                                                                            |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Pack ice                             |Sea ice not connected to land with an ice concentration of over 70 per cent.                                                                                                                                                                           |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Drift ice                            |Sea ice not connected to land with an ice concentration of under 70 per cent.                                                                                                                                                                          |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Amphibious vehicle                   |A self-propelled platform capable of operating on land and within or on the surface of a water body.                                                                                                                                                   |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Amphibious crawler                   |A self-propelled vehicle capable of operation on land or the seabed (e.g. beach crawler).                                                                                                                                                              |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|DUKW                                 |A six-wheel drive amphibious truck developed during the second World War.                                                                                                                                                                              |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Hovercraft                           |A craft capable of moving over water or land on a downwardly-propelled cushion of air.                                                                                                                                                                 |
+-------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


.. _CustomParameters:

Acoustic experimental parameters
=========================================

+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name                                                 |Element description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
+=============================================================+================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================+
|Sound pressure                                               |The difference between instantaneous total pressure and pressure that would exist in the absence of sound. This is in effect the quantity that is being represented when a sound pressure waveform is plotted.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Peak sound pressure                                          |The maximum sound pressure during a stated time interval. A peak sound pressure may arise from a positive or negative sound pressure. This quantity is typically useful as a metric for a pulsed waveform, though it may also be used to describe a periodic waveform.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Peak compressional pressure                                  |The maximum value of the magnitude of the compressional pressure during a stated time interval. Peak compressional pressure  is sometimes referred to as “peak-positive sound pressure”. A peak compressional pressure may only arise from a positive sound pressure. This quantity is typically most useful as a metric for a pulsed waveform, though it may also be used to describe a periodic waveform.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Peak rarefactional pressure                                  |The maximum value of the magnitude of the rarefactional pressure during a stated time interval. Peak rarefactional pressure is sometimes referred to as “peak-negative sound pressure”. A peak rarefactional pressure may only arise from a negative sound pressure, but is expressed as a positive valued quantity. This quantity is typically most useful as a metric for a pulsed waveform, though it may also be used to describe a periodic waveform.                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Peak to peak sound pressure                                  |The sum of the peak compressional pressure and the peak rarefactional pressure during a stated time interval. This quantity is typically most useful as a metric for a pulsed waveform, though it may also be used to describe a periodic waveform.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|RMS sound pressure                                           |The square root of the mean square pressure, where the mean square pressure is the time integral of squared sound pressure over a specified time interval divided by the duration of the time interval. The RMS sound pressure is calculated by first squaring the values of sound pressure, averaging over the specified time interval, and then taking the square root. The averaging time must always be stated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound exposure                                               |The integral of the square of the sound pressure over a stated time interval or event (such as an acoustic pulse).  As the integral of squared sound pressure over time, the quantity is sometimes called the “pressure-squared integral”. The quantity is sometimes taken as a proxy for the energy content of the sound wave (it may be converted to energy flux density by dividing by the specific acoustic impedance of the medium). When applied to an acoustic pulse, the integration time is the pulse duration. When applied to a single pulse (or event), the quantity is sometimes called “single pulse sound exposure” (or “single event sound exposure”). Note that the sound exposure useful as a measure of the exposure of a receptor to a sound field, and a frequency weighting is commonly applied. If a frequency weighting is applied, this should be indicated by appropriate subscripts. |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Cumulative sound exposure                                    |The sound exposure determined for an extended period or sequence of pulses/events.When stating the cumulative sound exposure, it is important to specify any other relevant information such number of pulses, total time duration, duty cycle of any sampling, etc. A more detailed discussion is provided in Section 2.3.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Pulse duration                                               |The time during which a specified percentage of sound energy in the signal occurs. In the calculation, sound exposure may be used as a proxy for energy. A typical value of the percentage taken is 90, so that the duration is the time window during which 90% of the energy is present. This metric is intended for use to describe pulsed signals. If the percentage is represented by X, the metric is typically calculated by starting at (50-X/2)% and ending at (50+X/2)% of total energy (or 5% to 95% when X = 90).Note that this definition covers only X% of the overall pulse; if it is necessary to account for all time (or energy) in the pulse (including the “missing” 10% in the example given), multiply the above value by 100/X.                                                                                                                                                          |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Pulse repetition frequency                                   |The number of pulses or events arriving per second. Note that this is not the same as the number of cycles of signal arriving per second (the acoustic frequency).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Spectral density                                             |Any quantity expressed as a contribution per unit of bandwidth.An example is sound exposure spectral density, expressed in units of Pa2·s/Hz.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound particle displacement                                  |The instantaneous displacement in a stated direction of a particle in a medium from its position in the absence of sound waves.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound particle velocity                                      |The instantaneous velocity of a material particle in a stated direction due to the action of sound waves. The sound particle velocity is equal to the rate of change with time of the acoustic particle displacement in a stated direction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound particle acceleration                                  |The instantaneous acceleration of a material particle in a stated direction due to the action of sound waves.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Mean square sound pressure                                   |The product of the sound pressure and the particle velocity at a point in the sound field. Sound intensity is a vector quantity and is expressed for a specific direction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Instantaneous sound intensity                                |The product of the sound pressure and the particle velocity at a point in the sound field. Sound intensity is a vector quantity and is expressed for a specific direction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Time-averaged sound intensity                                |The time-average of the sound intensity over a stated time interval in a stated direction. It is a vector quantity and is expressed for a specific direction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound energy flux density                                    |The time-integrated sound intensity at a far-field measurement position in a stated direction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound power                                                  |The sound power is the sound intensity integrated over a closed surface surrounding a source. It is the rate of sound energy radiated by a source.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Source factor                                                |The source factor is the product of the far-field acoustic pressure and the distance from the source in a stated direction in the acoustic far-field.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Acoustic pulse rise time                                     |The time required for the sound pressure to rise from X% to Y% of its maximum value, with 5% and 95% typically chosen for values of X and Y respectively.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Compressional pressure                                       |sound pressure, p(t), when p(t) &gt; 0, where t is time                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |             
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Rarefactional pressure                                       |magnitude of sound pressure, \|p(t)\|, when p(t) &lt; 0, where p is sound pressure and t is time                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound exposure spectral density                              |distribution as a function of non-negative frequency of the time-integrated squared sound pressure  per unit bandwidth of a sound having a continuous spectrum                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Equivalent plane wave sound intensity                        |mean-square sound pressure, mml_m22, divided by the product of the density, ρ, and sound speed, c, of the undisturbed fluid                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Mean-square sound pressure spectral density                  |distribution as a function of non-negative frequency of the mean-square sound pressure  per unit bandwidth of a sound having a continuous spectrum                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Force impulse                                                |integral of a transient force, over a specified time interval or event, for a specified frequency range                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Pressure impulse                                             |integral of a transient sound pressure , p(t), over a specified time interval or event, for a specified frequency range                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound pressure variance                                      |variance of the sound pressure, p(t), over a specified time interval, t1 to t2, for a specified frequency range                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound pressure skewness                                      |skewness of the sound pressure, p(t), over a specified time interval, t1 to t2, for a specified frequency range                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound pressure kurtosis                                      |kurtosis of the sound pressure, p(t), over a specified time interval, t1 to t2, for a specified frequency range                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Characteristic acoustic impedance                            |sound pressure divided by the component of the sound particle velocity in the direction of the wave propagation, at a point in a non-dissipative medium and for a plane progressive wave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Specific acoustic impedance                                  |Fourier transform of sound pressure, P(f), divided by the Fourier transform of sound particle velocity in a given direction, U(f)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound exposure source factor                                 |product of the square of the distance from the acoustic centre (3.3.1.3) of a source, in a specified direction, r2, and time-integrated squared sound pressure (3.1.3.5) in the acoustic far field (3.3.1.1) at that distance, Ep(r), of a sound source, if placed in a hypothetical infinite uniform lossless medium of the same density and sound speed as the real medium at the location of the source, with identical motion of all acoustically active surfaces as the true source in the true medium                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Source waveform                                              |The sound waveform of the source, measured as an intensity or pressure as a function of time                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Source spectrum                                              |The sound spectrum of the source, created by Fourier transforming the source waveform. Expressed as an intensity or pressure as a function of frequency                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Propagation factor                                           |mean-square sound pressure divided by the source factor in a specified direction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound exposure propagation factor                            |time-integrated squared sound pressure divided by the sound exposure source factor in a specified direction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Transmission loss                                            |reduction in a specified level between two specified points x1, x2 that are within an underwater acoustic field                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Propagation loss                                             |difference between source level  in a specified direction, LS, and mean-square sound pressure level, Lp(x), at a specified position, x                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sound exposure propagation loss                              |difference between sound exposure source level in a specified direction, LS,E, and time-integrated squared sound pressure level, LE,p(x), at a specified position, x</description>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Differential scattering cross section                        |quotient of the ensemble-average of the free-field time-averaged sound power radiated per unit solid angle in a specified direction in the far field of the scattered field by the magnitude of the time-averaged sound intensity of the incident field, for an incident plane wave and specified continuous incident signal                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Total scattering cross section                               |differential scattering cross section, σΩ, of an object, integrated over all solid angles with respect to the scattering direction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Absorption cross section                                     |quotient of the ensemble-average of the free-field time-averaged rate at which sound energy is converted to heat by the time-averaged sound intensity of the incident field, for an incident plane wave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Extinction cross section                                     |quotient of the mean rate of work done on a scatterer by the magnitude of the time-averaged sound intensity of the incident field, for an incident plane wave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Volume differential scattering cross section per unit volume |quotient of the ensemble-average of the free-field time-averaged sound power radiated per unit solid angle in a specified direction in the far field of the scattered field per unit volume of water by the time-averaged sound intensity of the incident field, for an incident plane wave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sea surface differential scattering per unit area            |ratio of the ensemble-average of the free-field time-averaged sound power radiated per unit solid angle in a specified direction in the far field of the scattered field per unit area of sea surface to the time-averaged sound intensity of the incident field, for an incident plane wave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sea bottom differential scattering per unit area             |ratio of the ensemble-average of the free-field time-averaged sound power radiated per unit solid angle in a specified direction in the far field of the scattered field per unit area of sea bottom to the time-averaged sound intensity of the incident field, for an incident plane wave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Effective signal duration                                    |square of the integral with respect to time of \|μ(t)\|2 divided by the integral with respect to time of \|μ(t)\|4, where μ(t) is the complex envelope of the sound pressure                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Threshold exceedance signal duration                         |time during which the mean-square sound pressure level  (SPL) exceeds a specified threshold y decibels below the maximum SPL, for a specified averaging time                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Percentage energy signal duration                            |time during which a specified percentage x of time-integrated squared sound pressure occurs, starting at (50 - x/2) % and ending at (50 + x/2) % of total energy                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Effective signal bandwidth                                   |square of the integral with respect to frequency of \|M(f)\|2 divided by the integral with respect to frequency of \|M(f)\|4, where M(f) is the Fourier transform of the complex envelope, μ(t), corresponding to a time-dependent field quantity, p(t)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sonar signal sound pressure                                  |sound pressure at a specified position caused by the presence of a target                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sonar signal voltage                                         |voltage at a sonar receiver, for a specified frequency band, caused by the sonar signal sound pressure                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Target echo                                                  |sound at a sonar receiver originating from an active sonar transmission, and subsequently re-radiated by a target                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Equivalent target strength                                   |difference between sum of target echo level (LTE), propagation loss from sonar transmitter to target (NPL,Tx), and propagation loss from target to sonar receiver (NPL,Rx), and source level (LS)610).</description>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Auditory frequency weighting function                        |frequency weighting function chosen to represent a specified frequency-dependent characteristic of hearing sensitivity in a particular type of animal, by which an acoustic quantity is adjusted to reflect the importance of frequency dependence to that animal                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Behavioural hearing threshold                                |minimum level of a specified sound signal  that is capable of evoking a behaviourally measurable auditory sensation in a specified fraction of trials, for a specific subject and for specified conditions, including measurement geometry                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Electrophysiological hearing threshold                       |minimum level of a specified signal  that is capable of evoking a detectable and reproducible electrophysiological response, for a specific subject and for specified conditions, including measurement geometry                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Hearing threshold shift                                      |change in the behavioural hearing threshold  or electrophysiological hearing threshold                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


.. _MD_KeywordTypeCode:

MD_KeywordTypeCode
=========================

+----------------+---------------------------------------------------------------------------------------------------------------+
|Element name    |Element description                                                                                            |
+================+===============================================================================================================+
|discipline      |keyword identifies a branch of instruction or specialized learning                                             |
+----------------+---------------------------------------------------------------------------------------------------------------+
|place           |keyword identifies a location                                                                                  |
+----------------+---------------------------------------------------------------------------------------------------------------+
|dataResolution  |keyword identifies a temporal or spatial resolution                                                            |
+----------------+---------------------------------------------------------------------------------------------------------------+
|stratum         |keyword identifies the layer(s) of any deposited substance                                                     |
+----------------+---------------------------------------------------------------------------------------------------------------+
|temporal        |keyword identifies a time period related to the dataset                                                        |
+----------------+---------------------------------------------------------------------------------------------------------------+
|theme           |keyword identifies a particular subject or topic                                                               |
+----------------+---------------------------------------------------------------------------------------------------------------+
|dataCentre      |keyword identifies a repository or archive that manages and distributes data                                   |
+----------------+---------------------------------------------------------------------------------------------------------------+
|featureType     |keyword identifies a resource containing or about a collection of feature instances with common characteristics|
+----------------+---------------------------------------------------------------------------------------------------------------+
|instrument      |keyword identifies a device used to measure or compare physical properties                                     |
+----------------+---------------------------------------------------------------------------------------------------------------+
|platform        |keyword identifies a structure upon which an instrument is mounted                                             |
+----------------+---------------------------------------------------------------------------------------------------------------+
|process         |keyword identifies a series of actions or natural occurrences                                                  |
+----------------+---------------------------------------------------------------------------------------------------------------+
|project         |keyword identifies an endeavour undertaken to create or modify a product or service                            |
+----------------+---------------------------------------------------------------------------------------------------------------+
|service         |keyword identifies an activity carried out by one party for the benefit of another                             |
+----------------+---------------------------------------------------------------------------------------------------------------+
|product         |keyword identifies a type of product                                                                           |
+----------------+---------------------------------------------------------------------------------------------------------------+
|subTopicCategory|refinement of a topic category for the purpose of geographic data classification                               |
+----------------+---------------------------------------------------------------------------------------------------------------+

.. _DS_AssociationTypeCode:

DS_AssociationTypeCode
==============================

+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name          |Element description                                                                                                                                                                |
+======================+===================================================================================================================================================================================+
|crossReference        |reference from one dataset to another                                                                                                                                              |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|largerWorkCitation    |reference to a master dataset of which this one is a part                                                                                                                          |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|partOfSeamlessDatabase|part of the same structured set of data held in a computer                                                                                                                         |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|source                |mapping and charting information from which the dataset content originates                                                                                                         |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|stereoMate            |part of a set of imagery that when used together, provides three-dimensional images                                                                                                |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|isComposedOf          |reference to resources that are parts of this resource                                                                                                                             |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|collectiveTitle       |common title for a collection of resources. NOTE: title identifies elements of a series collectively, combined with information about what volumes are available at the source cite|
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|series                |associated through a common heritage such as produced to a common product specification                                                                                            |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|dependency            |associated through a dependency                                                                                                                                                    |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|revisionOf            |resource is a revision of associated resource                                                                                                                                      |
+----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+



.. _CI_DateTypeCode:

CI_DateTypeCode
=======================

+---------------+------------------------------------------------------------------------------------------------------------------------------+
|Element name   |Element description                                                                                                           |
+===============+==============================================================================================================================+
|creation       |date identifies when the resource was brought into existence                                                                  |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|publication    |date identifies when the resource was issued                                                                                  |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|revision       |date identifies when the resource was examined or re-examined and improved or amended                                         |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|expiry         |date identifies when resource expires                                                                                         |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|lastUpdate     |date identifies when resource was last updated                                                                                |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|lastRevision   |date identifies when resource was last reviewed                                                                               |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|nextUpdate     |date identifies when resource will be next updated                                                                            |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|unavailable    |date identifies when resource became not available or obtainable                                                              |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|inForce        |date identifies when resource became in force                                                                                 |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|adopted        |date identifies when resource was adopted                                                                                     |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|deprecated     |date identifies when resource was deprecated                                                                                  |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|superseded     |date identifies when resource was superseded or replaced by another resource                                                  |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|validityBegins |time at which the data are considered to become valid. NOTE: There could be quite a delay between creation and validity begins|
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|validityExpires|time at which the data are no longer considered to be valid                                                                   |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|released       |the date that the resource shall be released for public access                                                                |
+---------------+------------------------------------------------------------------------------------------------------------------------------+
|distribution   |date identifies when an instance of the resource was distributed                                                              |
+---------------+------------------------------------------------------------------------------------------------------------------------------+


.. _CI_RoleCode:

CI_RoleCode
===================

+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|Element name         |Element description                                                                                                           |
+=====================+==============================================================================================================================+
|resourceProvider     |party that supplies the resource                                                                                              |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|custodian            |party that accepts accountability and responsibility for the data and ensures appropriate care and maintenance of the resource|
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|owner                |party that owns the resource                                                                                                  |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|sponsor              |party that sponsors the resource                                                                                              |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|user                 |party who uses the resource                                                                                                   |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|distributor          |party who distributes the resource                                                                                            |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|originator           |party who created the resource                                                                                                |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|pointOfContact       |party who can be contacted for acquiring knowledge about or acquisition of the resource                                       |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|principalInvestigator|key party responsible for gathering information and conducting research                                                       |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|processor            |party who has processed the data in a manner such that the resource has been modified                                         |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|publisher            |party who published the resource                                                                                              |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|author               |party who authored the resource                                                                                               |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|coAuthor             |party who jointly authors the resource                                                                                        |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|collaborator         |party who assists with the generation of the resource other than the principal investigator                                   |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|editor               |party who reviewed or modified the resource to improve the content                                                            |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|mediator             |a class of entity that mediates access to the resource and for whom the resource is intended or useful                        |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|rightsHolder         |party owning or managing rights over the resource                                                                             |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|contributor          |party contributing to the resource                                                                                            |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|funder               |party providing monetary support for the resource                                                                             |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+
|stakeholder          |party who has an interest in the resource or the use of the resource                                                          |
+---------------------+------------------------------------------------------------------------------------------------------------------------------+



.. _MD_RestrictionCode:

MD_RestrictionCode
==========================

+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name              |Element description                                                                                                                                                                                                                                              |
+==========================+=================================================================================================================================================================================================================================================================+
|copyright                 |exclusive right to the publication, production, or sale of the rights to a literary, dramatic, musical, or artistic work, or to the use of a commercial print or label, granted by law for a specified period of time to an author, composer, artist, distributor|
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|patent                    |government has granted exclusive right to make, sell, use or license an invention or discovery                                                                                                                                                                   |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|patentPending             |produced or sold information awaiting a patent                                                                                                                                                                                                                   |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|trademark                 |a name, symbol, or other device identifying a product, officially registered and legally restricted to the use of the owner or manufacturer                                                                                                                      |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|license                   |formal permission to do something                                                                                                                                                                                                                                |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|intellectualPropertyRights|rights to financial benefit from and control of distribution of non-tangible property that is a result of creativity                                                                                                                                             |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|restricted                |withheld from general circulation or disclosure                                                                                                                                                                                                                  |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|otherRestrictions         |limitation not listed                                                                                                                                                                                                                                            |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|unrestricted              |no constraints exist                                                                                                                                                                                                                                             |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|licenceUnrestricted       |formal permission not required to use the resource                                                                                                                                                                                                               |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|licenceEndUser            |formal permission required for a person or an entity to use the resource and that may differ from the person that orders or purchases it                                                                                                                         |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|licenceDistributor        |formal permission required for a person or an entity to commercialize or distribute the resource                                                                                                                                                                 |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|private                   |protects rights of individual or organizations from observation, intrusion, or attention of others                                                                                                                                                               |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|statutory                 |prescribed by law                                                                                                                                                                                                                                                |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|confidential              |not available to the public contains information that could be prejudicial to a commercial, industrial, or national interest                                                                                                                                     |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|SBU                       |although unclassified, requires strict controls over its distribution.                                                                                                                                                                                           |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|in-confidence             |with trust                                                                                                                                                                                                                                                       |
+--------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


.. _MD_ClassificationCode:

MD_ClassificationCode
=============================

+-------------------+---------------------------------------------------------------------------------------------------------+
|Element name       |Element description                                                                                      |
+===================+=========================================================================================================+
|unclassified       |available for general disclosure                                                                         |
+-------------------+---------------------------------------------------------------------------------------------------------+
|restricted         |not for general disclosure                                                                               |
+-------------------+---------------------------------------------------------------------------------------------------------+
|confidential       |available for someone who can be entrusted with information                                              |
+-------------------+---------------------------------------------------------------------------------------------------------+
|secret             |kept or meant to be kept private, unknown, or hidden from all but a select group of people               |
+-------------------+---------------------------------------------------------------------------------------------------------+
|topSecret          |of the highest secrecy                                                                                   |
+-------------------+---------------------------------------------------------------------------------------------------------+
|SBU                |although unclassified, requires strict controls over its distribution                                    |
+-------------------+---------------------------------------------------------------------------------------------------------+
|forOfficialUseOnly |unclassified information that is to be used only for official purposes determined by the designating body|
+-------------------+---------------------------------------------------------------------------------------------------------+
|protected          |compromise of the information could cause damage                                                         |
+-------------------+---------------------------------------------------------------------------------------------------------+
|limitedDistribution|dissemination limited by designating body                                                                |
+-------------------+---------------------------------------------------------------------------------------------------------+

.. _MD_ScopeCode:

MD_ScopeCode
====================

+--------------------+--------------------------------------------------------------------------------+
|Element name        |Element description                                                             |
+====================+================================================================================+
|attribute           |information applies to the attribute class                                      |
+--------------------+--------------------------------------------------------------------------------+
|attributeType       |information applies to the characteristic of a feature                          |
+--------------------+--------------------------------------------------------------------------------+
|collectionHardware  |information applies to the collection hardware class                            |
+--------------------+--------------------------------------------------------------------------------+
|collectionSession   |information applies to the collection session                                   |
+--------------------+--------------------------------------------------------------------------------+
|dataset             |information applies to the dataset                                              |
+--------------------+--------------------------------------------------------------------------------+
|series              |information applies to the series                                               |
+--------------------+--------------------------------------------------------------------------------+
|nonGeographicDataset|information applies to non-geographic data                                      |
+--------------------+--------------------------------------------------------------------------------+
|dimensionGroup      |information applies to a dimension group                                        |
+--------------------+--------------------------------------------------------------------------------+
|feature             |information applies to a feature                                                |
+--------------------+--------------------------------------------------------------------------------+
|featureType         |information applies to a feature type                                           |
+--------------------+--------------------------------------------------------------------------------+
|propertyType        |information applies to a property type                                          |
+--------------------+--------------------------------------------------------------------------------+
|fieldSession        |information applies to a field session                                          |
+--------------------+--------------------------------------------------------------------------------+
|software            |information applies to a computer program or routine                            |
+--------------------+--------------------------------------------------------------------------------+
|model               |information applies to a copy or imitation of an existing or hypothetical object|
+--------------------+--------------------------------------------------------------------------------+
|tile                |information applies to a tile, a spatial subset of geographic data              |
+--------------------+--------------------------------------------------------------------------------+
|metadata            |information applies to metadata                                                 |
+--------------------+--------------------------------------------------------------------------------+
|initiative          |information applies to an initiative                                            |
+--------------------+--------------------------------------------------------------------------------+
|sample              |information applies to a sample                                                 |
+--------------------+--------------------------------------------------------------------------------+
|document            |information applies to a document                                               |
+--------------------+--------------------------------------------------------------------------------+
|aggregate           |information applies to an aggregate resource                                    |
+--------------------+--------------------------------------------------------------------------------+
|product             |metadata describing an ISO 19131 data product specification                     |
+--------------------+--------------------------------------------------------------------------------+
|collection          |information applies to an unstructured set                                      |
+--------------------+--------------------------------------------------------------------------------+
|coverage            |information applies to a coverage                                               |
+--------------------+--------------------------------------------------------------------------------+

.. _MD_MaintenanceFrequencyCode:

MD_MaintenanceFrequencyCode
===================================

+------------+--------------------------------------------------------+
|Element name|Element description                                     |
+============+========================================================+
|continual   |data is repeatedly and frequently updated               |
+------------+--------------------------------------------------------+
|daily       |data is updated each day                                |
+------------+--------------------------------------------------------+
|weekly      |data is updated on a weekly basis                       |
+------------+--------------------------------------------------------+
|fortnightly |data is updated every two weeks                         |
+------------+--------------------------------------------------------+
|monthly     |data is updated each month                              |
+------------+--------------------------------------------------------+
|quarterly   |data is updated every three months                      |
+------------+--------------------------------------------------------+
|biannually  |data is updated twice each year                         |
+------------+--------------------------------------------------------+
|annually    |data is updated every year                              |
+------------+--------------------------------------------------------+
|asNeeded    |data is updated as deemed necessary                     |
+------------+--------------------------------------------------------+
|irregular   |data is updated in intervals that are uneven in duration|
+------------+--------------------------------------------------------+
|notPlanned  |there are no plans to update the data                   |
+------------+--------------------------------------------------------+
|unknown     |frequency of maintenance for the data is not known      |
+------------+--------------------------------------------------------+


.. _OOIList:

OOI Instrument types
===========================

+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name                               |Element description                                                                                                                                                                                                                                                                                                                |
+===========================================+===================================================================================================================================================================================================================================================================================================================================+
|Air-sea interface pCO2 sensor              |Located at the sea surface, an Air-Sea Interface pCO2 Sensor measures the partial pressure of carbon dioxide (pCO2) in both the atmosphere and ocean. These measurements are used to calculate the exchange of CO2 between the air and sea (Air-Sea CO2 Flux).                                                                     |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Benthic fluid flow rate sampler            |A Benthic Fluid Flow Rate Sampler measures the speed at which fluids seep from Earth's crust into the surrounding ocean (Benthic Fluid Flow Rate).                                                                                                                                                                                 |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Bio-acoustic sonar                         |Bio-acoustic Sonar measures fish and zooplankton concentrations using Acoustics. This instrument emits sound waves into the water column, which bounce off organisms back towards the sensor in a phenomenon known as 'backscatter'. The more organisms, the higher the backscatter.                                               |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CTD                                        |A CTD is so named as it measures Conductivity, Temperature and Depth.  These parameters can then be used to calculate Salinity and Density.                                                                                                                                                                                        |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Digital camera                             |Digital Cameras capture high-resolution photos (Still Images) of the seafloor environment that can be used for analytical work.                                                                                                                                                                                                    |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Dissolved oxygen sensor                    |A Dissolved Oxygen Sensor measures the concentration of oxygen molecules that have been dissolved, or mixed, into seawater (Dissolved Oxygen Concentration).                                                                                                                                                                       |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|DNA sampler                                |A DNA Sampler filters a volume of seawater and preserves the particulate matter for genetic analysis after the instrument is recovered.                                                                                                                                                                                            |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Fluorometer                                |A Fluorometer is a device used to measure patterns of Fluorescence. These data are used to determine Chlorophyll, Dissolved Organic Matter, and Turbidity.                                                                                                                                                                         |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|HD video camera                            |HD Video Cameras capture High Definition (HD) Video of the seafloor environment that can be used for analytical work.                                                                                                                                                                                                              |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Hydrophone                                 |A Hydrophone is a passive acoustic sensor that listens for earthquakes, sea creatures, and human-generated noise in the ocean.                                                                                                                                                                                                     |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Hydrothermal vent fluid chemistry sensor   |Hydrothermal Vent Fluid Chemistry Sensors measure the chemical composition of the mineral-rich fluid plumes that emanate from cracks on the seafloor, providing insight into the sub-surface structure and dynamics of these unique habitats.                                                                                      |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Hydrothermal vent fluid sampler            |A Hydrothermal Vent Fluid Sampler collects a water sample and takes its temperature at the time of collection. Once recovered, laboratory tests are used to examine the chemistry of the vent fluid samples.                                                                                                                       |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Hydrothermal vent fluid temperature sensor |Hydrothermal Vent Fluid Temperature Sensors measure the Water Temperature of the mineral-rich fluid plumes that emanate from cracks on the seafloor, providing insight into the sub-surface structure and dynamics of these unique habitats.                                                                                       |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Light meter                                |A Light Meter is used to measure Downwelling Irradiance, the amount of light at a particular depth in the water column.                                                                                                                                                                                                            |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Mass spectrometer                          |A Mass Spectrometer measures the masses and relative concentrations of atoms and molecules in a water sample.                                                                                                                                                                                                                      |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Nitrate sensor                             |Nitrate Sensors measure the amount of nitrate (NO3-) dissolved in seawater.                                                                                                                                                                                                                                                        |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|pH sensor                                  |pH Sensors measure the concentration of hydrogen ions in a solution.  Seawater has an average pH of 8.2, which is currently decreasing due to increases in carbon dioxide, a phenomenon known as Ocean Acidification.                                                                                                              |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Phtosynthetically active radiation sensor  |A Photosynthetically Active Radiation (PAR) Sensor is used to measure the spectral range of light that is available for use by primary producers for photosynthesis (400-700 nanometers).                                                                                                                                          |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Seafloor pressure and tilt sensor          |Seafloor Pressure and Tilt Sensors measure the force on the seafloor exerted by the weight of the overlying water and atmosphere (pressure) and movement of the seafloor itself (tilt). These measurements are used to understand changes in water depth (tides, waves) and the structure and dynamics of Oceanic Tectonic Plates. |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Seafloor pressure sensor                   |A Seafloor Pressure Sensor measures the force on the seafloor exerted by the weight of the overlying water and atmosphere.                                                                                                                                                                                                         |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Sea-surface vertical eddy flux sensor      |A Sea-Surface Vertical Eddy Flux Sensor measures a suite of parameters that describe the exchange of heat, moisture, and momentum between the ocean and the atmosphere.  Sea-Surface Vertical Eddy Flux Sensors measure Air Temperature, Air-Sea Heat Flux, Wind Velocity, and Humidity.                                           |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Seawater pCO2 sensor                       |Seawater pCO2 Sensors measure the partial pressure of CO2 in seawater. Carbon enters the ocean mainly through the dissolution of atmospheric CO2 and undergoes a complex series of biological and chemical reactions.                                                                                                              |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Seismometer                                |Seismometers measure Seafloor Movement.  These measurements provide insight into Seismic Activity and help to understand Volcanic Tremors, Seismology (including Earthquakes), and dynamics of Oceanic Tectonic Plates.                                                                                                            |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Surface wave sensor                        |A Surface Wave Sensor measures the frequency, height, period, and direction of waves on the ocean surface (Wave Properties). These sensors help to understand Turbulent Mixing in the surface ocean.                                                                                                                               |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Turbidity meter                            |A Turbidity Meter measures suspended solids in seawater; i.e. cloudiness caused by particles in the water.                                                                                                                                                                                                                         |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Velocity profiler - horizontal             |The Velocity Profiler-Horizontal is an array of echo sounders on the seafloor. They send 'pings' (i.e., sound waves) to the sea surface and measure the length of time it takes the pings to return. These measurements are used to calculate the average horizontal movement of water within a column.                            |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Velocity profiler - vertical               |A Velocity Profiler - Vertical uses Acoustics to measure Water Velocity. Sound waves emitted by the profiler scatter off suspended particles and back to the sensor. The sensor calculates velocity by measuring changes in these sound waves (i.e., Doppler shifts).                                                              |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Water velocity meter                       |A Water Velocity Meter measures the speed and direction of water as it moves past a single point.                                                                                                                                                                                                                                  |
+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. _MI_EventTypeCode:

MER:MI_EventTypeCode
===========================
+-----------------------------+-------------------------------------------------------------------------------------------------+
|Element name                 |Element description                                                                              |
+=============================+=================================================================================================+
|announcement                 |Event which precedes other forthcoming events                                                    |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|calibration                  |Event which indicates when the instrument's readings were aligned to match with physical reality |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|calibrationCoefficientUpdate |Event which indicates an update in calibration (as opposed to a whole new calibration)           |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|dataLoss                     |Event either which caused data loss or was caused by data loss                                   |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|fatal                        |Event which renders the instrument unusable                                                      |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|manoeuvre                    |Event tied to movements of the instrument                                                        |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|missingData                  |Event which either caused data to go missing or was caused by missing data                       |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|notice                       |General event which describes other closely related events                                       |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|preLaunch                    |Event related to the pre-launch period                                                           |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|severe                       |Event which had a significant impact on the performance of the instrument                        |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|switchOff                    |Event which switched off or intentionally disabled the instrument                                |
+-----------------------------+-------------------------------------------------------------------------------------------------+
|switchOn                     |Event which switched on or intentionally enabled the instrument                                  |
+-----------------------------+-------------------------------------------------------------------------------------------------+

.. _MI_OperationTypeCode:

MI_OperationTypeCode
============================

+------------+------------------------------------------------------------------+
|Element name|Element description                                               |
+============+==================================================================+
|real        |originates from live-fly or other non-simulated operational source|
+------------+------------------------------------------------------------------+
|simulated   |originates from target simulator sources                          |
+------------+------------------------------------------------------------------+
|synthesized |mix of real and simulated data                                    |
+------------+------------------------------------------------------------------+


.. _MI_TriggerCode:

MI_TriggerCode
======================

+-------------+--------------------------------------------+
|Element name |Element description                         |
+=============+============================================+
|automatic    |event due to external stimuli               |
+-------------+--------------------------------------------+
|manual       |event manually instigated                   |
+-------------+--------------------------------------------+
|preProgrammed|event instigated by planned internal stimuli|
+-------------+--------------------------------------------+


.. _MI_ContextCode:

MI_ContextCode
======================

+------------+------------------------------------------+
|Element name|Element description                       |
+============+==========================================+
|acquisition |event related to a specific domain        |
+------------+------------------------------------------+
|pass        |event related to a sequence of collections|
+------------+------------------------------------------+
|wayPoint    |event related to navigational manoeuvre   |
+------------+------------------------------------------+


.. _MI_SequenceCode:

MI_SequenceCode
=======================

+-------------+-----------------------------------------+
|Element name |Element description                      |
+=============+=========================================+
|start        |beginning of a collection                |
+-------------+-----------------------------------------+
|end          |end of a collection                      |
+-------------+-----------------------------------------+
|instantaneous|collection without a significant duration|
+-------------+-----------------------------------------+


.. _BasisOfRecordList:

dwc:BasisOfRecordList
=============================

+------------------+----------------------------------------------+
|Element name      |Element description                           |
+==================+==============================================+
|HumanObservation  |An output of a human observation process.     |
+------------------+----------------------------------------------+
|MachineObservation|An output of a machine observation process.   |
+------------------+----------------------------------------------+

.. _DataLicenses:

Common data licenses
==========================

+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name      |Element description                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+==================+=============================================================================================================================================================================================================================================================================================================================================================================================================================================================+
|CC-BY (4.0)       |Creative Commons - Attribution. This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use of licensed materials.                                                                                                                                               |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC-BY-SA (4.0)    |Creative Commons - Attribution - Share Alike. This license lets others remix, tweak, and build upon your work even for commercial purposes, as long as they credit you and license their new creations under the identical terms. This license is often compared to "copyleft" free and open source software licenses.                                                                                                                                       |
|                  |All new works based on yours will carry the same license, so any derivatives will also allow commercial use. This is the license used by Wikipedia, and is recommended for materials that would benefit from incorporating content from Wikipedia and similarly licensed projects.                                                                                                                                                                           |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC-BY-ND (4.0)    |Creative Commons - Attribution - No derivatives. This license lets others reuse the work for any purpose, including commercially; however, it cannot be shared with others in adapted form, and credit must be provided to you.                                                                                                                                                                                                                              |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC-BY-NC (4.0)    |Creative Commons - Attribution - Non-commercial. This license lets others remix, tweak, and build upon your work non-commercially, and although their new works must also acknowledge you and be non-commercial, they don't have to license their derivative works on the same terms.                                                                                                                                                                        |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC-BY-NC-SA (4.0) |Creative Commons - Attribution - Non-commercial - Share Alike. This license lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms.                                                                                                                                                                                                                       |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC-BY-NC-ND (4.0) |Creative Commons - Attribution - Non-commercial - No derivatives. This license is the most restrictive of our six main licenses, only allowing others to download your works and share them with others as long as they credit you, but they can't change them in any way or use them commercially.                                                                                                                                                          |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC0 (4.0)         |Creative Commons - Public Domain.  If you are the creator and owner of the copyright-protected work, choosing this option indicates you have waived all copyright protection and opted out of any exclusive rights granted to creators. You may only apply CC0 to your own work. You may retain certain moral (not legal) rights through the use of CC0.                                                                                                     |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|PDDL (1.0)        |Open Data Commons Public Domain Dedication and License. The PDDL places the data(base) in the public domain (waiving all rights). Similar to CC0.                                                                                                                                                                                                                                                                                                            |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|ODC-By (1.0)      |Open Data Commons Attribution License. Allows others to share, create, or adapt upon the data(base), providing they attribute any public use of the data(base) or works produced from the data(base) as specified in the license. Similar to CC-By.                                                                                                                                                                                                          |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|ODC-ODbL (1.0)    |Open Data Commons Open Database License. Allows others to share, create, or adapt upon the data(base), providing they attribute any public use of the data(base) or works produced from the data(base) as specified in the license, they share any adapted versions of the data(base) under the same license, and must offer an open version of the data(base) if they opt to redistribute the original or distribute their adaptation. Similar to CC-BY-SA. |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|OTHER             |Any license not described here. Provide details on the license (e.g., full text or a link to access full text) in the field below.                                                                                                                                                                                                                                                                                                                           |
+------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


Common software licenses
===========================

+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Element name                                |Element description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
+============================================+=====================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================+
|GNU General Public License 3.0              |A copyleft license for software. Allows users substantial freedom of use and re-use, provided that changes are tracked and identified, and modifications of GPL 3 code (including software packaging) must be released under the same license. Equivalent access must be provided to compiled binaries and source. Note that users obtain the same rights as you - so are therefore allowed to redistribute software under their own terms. Further details available at gnu.org/licenses/gpl-3.0.html                                               |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|GNU General Public License 2.0              |A copyleft license for software. Similar to GNU GPL 3.0, but lacks direct compatibility with the Apache 2.0 license, lacks some protection against patent issues, and does not enforce the right to user control. Further details available at gnu.org/licenses/old-licenses/gpl-2.0.html                                                                                                                                                                                                                                                            |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|GNU Lesser General Public License 3.0       |A version of the GNU GPL 3.0 which permits use of the software in entirely proprietary programs - and thus is not strictly copyleft. Further details are available at gnu.org/licenses/lgpl-3.0.html                                                                                                                                                                                                                                                                                                                                                 |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|X11 License                                 |Sometimes called the MIT License. A lax permissive non-copyleft license for software. Essentially allows free unrestricted use so long as the original copyright and license statements are included. The X11 license is a slightly expanded version of the traditional "MIT" license which adds a restriction preventing using the license holders' names for advertising without permission. Further details available at spdx.org/licenses/X11.html                                                                                               |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Mozilla Public License 2.0                  |A copyleft software license which allows combining MPL 2.0 and proprietary software, so long as MPL 2.0 software is kept separate. Compatible with GPL 2.0 and newer. Further details available at mozilla.org/en-US/MPL/2.0/                                                                                                                                                                                                                                                                                                                        |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Common Development and Distribution License |A software license which requires source code files under CDDL to remain under CDDL. While the license allows combining software from multiple licenses, it is not compatible with GPL. Further details are available at opensource.org/licenses/CDDL-1.0                                                                                                                                                                                                                                                                                            |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Eclipse Public License 2.0                  |A software license with weak copyleft, allowing users to use, modify, copy, or distribute the work or modifications to it under the same license. Source code must be made available. Additions and changes which are not derivative may be re-licensed. Users also gain a license to any patents held by the creators covering modifications. It is not strictly compatible with the GNU GPL, but allows a secondary license designation which can incorporate mismatched licenses. For further details refer to eclipse.org/legal/epl-2.0/faq.php  |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Modified BSD License                        |Also known as the 3-clause BSD License. Allows almost unlimited freedom so long as the BSD copyright and license notice are included. Not to be confused with the original 4-clause BSD license. The 3-clause BSD removes the clause regarding advertising materials. For further details refer to opensource.org/licenses/BSD-3-Clause                                                                                                                                                                                                              |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|FreeBSD License                             |Also known as the 2-clause BSD License. Allows almost unlimited freedom so long as the BSD copyright and license notice are included. Not to be confused with the original 4-clause BSD license or the modified (3-clause) BSD license. The 3-clause BSD removes the clause regarding advertising materials, and the 2-clause BSD further removes a clause regarding endorsements. For further details refer to opensource.org/licenses/BSD-2-Clause                                                                                                 |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|Apache License 2.0                          |A permissive non-copyleft license. The same license must be applied to all unmodified parts and any original copyright, patent, trademark, etc... notices must be preserved, and any changes noted. Not compatible with GNU GPL 2.0. For more details refer to apache.org/licenses/LICENSE-2.0.html                                                                                                                                                                                                                                                  |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CC0 (4.0)                                   |Creative Commons - Public Domain.  If you are the creator and owner of the copyright-protected work, choosing this option indicates you have waived all copyright protection and opted out of any exclusive rights granted to creators. You may only apply CC0 to your own work. You may retain certain moral (not legal) rights through the use of CC0.                                                                                                                                                                                             |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|OTHER                                       |Any license not described here. Provide details on the license (e.g., full text or a link to access full text) in the field below.                                                                                                                                                                                                                                                                                                                                                                                                                   |
+--------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+




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