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EA:  SOUNDING_DATUM_TYPE

Status: STD 2005/06/07
Code: 1304

Concept definition: The type of a <SOUNDING_DATUM>.
 
Attribute value type: ENUMERATION
Reference type: IR
Reference: [S57A, Attribute: VERDAT]
Supplemental references:  

Enumerants (presented in a natural order)
Status Attribute label Enumerant label ▾ Concept definition Code Ref type Reference Supplemental references
STD
2005/06/07
SOUNDING_DATUM_TYPE LOWEST_ASTRONOMICAL-
_TIDE
The lowest <<TIDE_LEVEL>> that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions; lowest astronomical tide. 23 PR [S57A, Attribute, VERDAT:23]  
STD
2005/06/07
SOUNDING_DATUM_TYPE LOWEST_LOW_SPRINGS An arbitrary level conforming to the lowest water level observed at a <LOCATION> at <SPRING_TIDE>s during a period shorter than 19 years; lowest low water springs. 24 PR [S57A, Attribute, VERDAT:6]  
STD
2005/06/07
SOUNDING_DATUM_TYPE LOWEST_LOW_WATER An arbitrary level conforming to the lowest <TIDE> observed at a <LOCATION>, or somewhat lower; lowest low water. 25 PR [S57A, Attribute, VERDAT:4]  
STD
2005/06/07
SOUNDING_DATUM_TYPE LOW_WATER An approximation of <<<MEAN_LOW_WATER>>> adopted as the reference level for a limited <REGION>, irrespective of better determinations later. Used mostly in <HARBOUR> and river engineering. Used in <INLAND_WATER>s. It is generally defined as a level which the daily mean water level would fall below less than 5 percent of the time and by no more than 0,2 metres during the navigation season. A single level <SURFACE> is usually chosen as the low water <DATUM> for a whole <LAKE>. On a <RIVER>, low water <DATUM> is a sloping <SURFACE>, which approximates the <WATERBODY_SURFACE> of the <RIVER> at a low state. 19 PR [S57A, Attribute, VERDAT:13] [TCG, "low water datum (LWD)", (2)]
STD
2005/06/07
SOUNDING_DATUM_TYPE LOW_WATER_SPRINGS A level approximating that of <<<MEAN_LOW_SPRINGS>>>; low water springs. 20 IR [S57A, Attribute, VERDAT:9] [FACC, Annex B, VDC:93]
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_HGHR_HIGH_SPRINGS The mean height of <<<HGHR_HIGH_WATER>>> at <SPRING_TIDE>s at a <LOCATION>; mean higher high water springs. 26 IR [FACC, Annex B, VDC:24]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_HGHR_HIGH_WATER The mean height of <<<HGHR_HIGH_WATER>>>s at a <LOCATION> over a 19-year period; mean higher high water. 27 PR [S57A, Attribute, VERDAT:21]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_HIGH_NEAPS The mean height of the <<<HIGH_WATER>>>s of the <NEAP_TIDE>; mean high water neaps, neap high water, or high water neaps [TCG, "neap tides or tidal currents"]. 28 IR [FACC, Annex B, VDC:8]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_HIGH_SPRINGS The mean height of the <<<HIGH_WATER>>>s of <SPRING_TIDE>s; mean high water springs or spring high water. 29 PR [S57A, Attribute, VERDAT:17]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_HIGH_WATER The mean height of all <<<HIGH_WATER>>>s at a <LOCATION> over a 19-year period; mean high water. 30 PR [S57A, Attribute, VERDAT:16]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_LOWER_LOW_SPRINGS The mean height of <<<LOWER_LOW_WATER>>> at <SPRING_TIDE>s at a <LOCATION>; mean lower low water springs. 34 PR [S57A, Attribute, VERDAT:2]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_LOWER_LOW_WATER The mean height of the <<<LOWER_LOW_WATER>>>s at a <LOCATION> over a 19-year period; mean lower low water. 35 PR [S57A, Attribute, VERDAT:12]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_LOW_NEAPS The mean height of the lowest <<TIDE_LEVEL>>s of the <NEAP_TIDE>; mean low neaps [TCG, "neap tides or tidal currents"]. 31 IR [FACC, Annex B, VDC:12]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_LOW_SPRINGS The mean height of the lowest <<TIDE_LEVEL>>s of <SPRING_TIDE>s; mean low water springs or spring low water. 32 PR [S57A, Attribute, VERDAT:1]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_LOW_WATER The mean height of all the lowest <<TIDE_LEVEL>>s at a <LOCATION> over a 19-year period; mean low water. 33 PR [S57A, Attribute, VERDAT:5]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_SEA_LEVEL The mean height of the <WATERBODY_SURFACE> of the <OCEAN> at a <TIDE_DATA_POINT> for all stages of the <TIDE> over a 19-year period; mean sea level (MSL). MSL is usually determined from hourly height readings measured from a fixed predetermined reference level. 36 PR [S57A, Attribute, VERDAT:3]  
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_TIDE_LEVEL The level midway between <<<MEAN_HIGH_WATER>>> and <<<MEAN_LOW_WATER>>>; mean tide level. It is also known as half tide level, and it may differ slightly from <<<MEAN_SEA_LEVEL>>>. 37 PR [S32, "mean tide level"] [FACC, Annex B, VDC:16]
STD
2005/06/07
SOUNDING_DATUM_TYPE MEAN_WATER_LEVEL The mean of all hourly water levels over the available period of record; mean water level. 38 PR [S57A, Attribute, VERDAT:26]  
STD
2005/06/07
SOUNDING_DATUM_TYPE NATIONAL_DATUM An arbitrary <SURFACE_DATUM> defined by a national authority, from which levels and tidal heights are measured by this authority; national datum. 39  
STD
2005/06/07
SOUNDING_DATUM_TYPE NEAP_TIDE <NEAP_TIDE>. 40     [FACC, Annex B, VDC:17]

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