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Vocabulary

SeaDataNet depth measurement reference planes

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URI http://vocab.nerc.ac.uk/collection/L11/current/
DescriptionTerms used to describe the zero point for vertical co-ordinate reference systems (datums).
CreatorSeaDataNet
Modified2017-05-23
Version Info10
Identifier L11
Register Manager British Oceanographic Data Centre
Register Owner SeaDataNet
Members
Identifier PrefLabel Definition Date
D33 Baltic Sea Chart Datum 2000 The elevation of the zero metres contour in the Baltic Sea as approved by the IHO Baltic Sea Hydrographic Commission as the common chart datum for the Baltic Sea. The datum refers to each Baltic country´s realization of the European Vertical Reference System (EVRS), which is connected to the Normaal Amsterdams Peil (NAP). 2017-05-22
D23 Belfast Ordnance Datum Mean sea level at Clarendon Loch, Belfast averaged between 1951 and 1956 used for the elevation of the zero metres contour on Ordnance Survey of Northern Ireland maps. 2007-02-16
D06 Bulgarian Navy Hydrographic Service Chart Datum The elevation of the zero metres contour on the navigation charts produced by the Bulgarian Navy. 2007-02-16
D21 Danish Vertical Reference 1990 Danish mean sea level during 1990 introduced in 2001 and adopted as the level of the zero metre contour in Denmark in 2003. 2007-02-16
D07 French Naval Chart Datum The elevation of the zero metres contour on the navigation charts produced by the French Navy. 2007-02-16
D30 French Naval Chart Datum for Lebanon The elevation of the zero metres contour on the navigation charts produced by the French Navy for Lebanese coastal waters. 2007-08-23
D05 Hellenic Navy Hydrographic Service Chart Datum The elevation of the zero metres contour on the navigation charts produced by the Greek Navy. 2007-02-16
D27 Helsinki Tide Gauge Datum Finnish national benchmark network mean sea level datum. 2007-02-16
D02 Highest Astronomical Tide The highest level expected to be reached by the sea surface after pertubations due to waves have been filtered out under average meteorological conditions and any combination of astronomical conditions. 2007-02-16
D01 Lowest Astronomical Tide The lowest level expected to be reached by the sea surface after pertubations due to waves have been filtered out under average meteorological conditions and any combination of astronomical conditions. 2007-02-16
D24 Malin Ordnance Datum Mean sea level at Portmoor Pier, Malin Head averaged between 1960 and 1969 used for the elevation of the zero metres contour on Ordnance Survey of Ireland maps since 1970. 2007-02-16
D19 Normaal Amsterdams Peil Elevation marked by a brass benchmark in Amsterdam approximating to mean sea level at the Dutch Coast. Sometimes referred to as Normalnull and used as the zero metre contour in much of Western Europe.. 2007-02-16
D20 Ordnance Datum Newlyn Mean sea level at Newlyn in Cornwall averaged between 1915 and 1921 used for the elevation of the zero metres contour on UK Ordnance Survey maps. 2007-02-16
D25 Poolbeg Ordnance Datum Spring tide low water at Poolbeg Lighthouse, Dublin on 8 April 1837 used for the elevation of the zero metres contour on Ordnance Survey of Ireland maps before 1970. 2007-02-16
D32 Portuguese Chart Datum The elevation of the zero metres contour on Portuguese navigation charts for Portuguese coastal waters. It has been set near the theoretical level reached by the lowest astronomical tide (LAT) calculated from tide gauge data. 2012-12-12
D14 Rijkswaterstaat mean sea level The mean sea level for a period of minimal 2 days converted to a many-year average based on measurements taken at the specified location. 2007-02-16
D28 Réseau Géodésique Français 80 The vertical component of a French 3-D CRS computed in 1980 until superseded in 1993 approximating to mean sea level 2007-08-10
D29 Réseau Géodésique Français 93 The vertical component of a French 3-D CRS computed in 1993 approximating to mean sea level 2007-08-10
D31 Spanish Chart Datum The elevation of the zero metres contour on the navigation charts produced by the Spanish Hydrographic Office for the Spanish coastal waters. 2009-04-28
D26 Swedish national coordinate system Swedish national benchmark network mean sea level datum. 2007-02-16
D04 UK Admiralty Chart Datum The elevation of the zero metres contour on the navigation charts produced for commercial marine navigation by the UK Hydrographic Office. It approximates to LAT. 2008-11-25
D10 ground level The level of the land surface at an unspecified location of interest. Usually associated with meteorological instruments tethered to the ground. 2007-02-16
D99 inapplicable There is no appropriate value. To be used in cases where metadata elements cannot be set null due to schema constraints e.g. when using a 3D CRS specification schema to describe 2D data. 2011-08-26
D22 local reference plane A local fixed elevation, usually labelled with a benchmark like a bolt, connected to a national datum through levelling. 2007-02-16
D13 mean high water The average of the highest elevation reached during at least two tidal cycles, but generally many more. 2007-02-16
D18 mean high water neaps The average throughout the year (when the average maximium declination of the moon is 23.5 degrees) of two successive high waters during those periods of 24 hours when the range of the tide is at its least. 2007-02-16
D16 mean high water springs The average throughout the year (when the average maximium declination of the moon is 23.5 degrees) of two successive high waters during those periods of 24 hours when the range of the tide is at its greatest. 2007-02-16
D12 mean low water The average of the lowest elevation reached during at least two tidal cycles, but generally many more. 2007-02-16
D17 mean low water neaps The average throughout the year (when the average maximium declination of the moon is 23.5 degrees) of two successive low waters during those periods of 24 hours when the range of the tide is at its least. 2007-02-16
D15 mean low water springs The average throughout the year (when the average maximium declination of the moon is 23.5 degrees) of two successive low waters during those periods of 24 hours when the range of the tide is at its greatest. 2007-02-16
D11 mean sea level The average elevation of the sea surface over an unspecified time period of at least a tidal cycle, but generally much longer. 2007-02-16
D09 sea floor The level of the sea floor at the location of interest. Usually associated with vertical position co-ordinates of oceanographic instruments tethered to the sea floor. 2007-02-16
D08 sea level The level of the sea surface at an unspecified time and location of interest. Usually associated with water depth measurements by shipboard echo sounder. May be anywhere between LAT and HAT. 2007-02-16
UKN unknown The correct value is not known to, and not computable by, the creator of this information. However, a correct value probably exists. 2009-01-12
D03 unspecified chart datum The elevation of the zero metres contour on an unspecified marine navigation chart. These are generally based on LAT which represents the safest option for navigation. 2007-02-16