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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 LOWER_LOW_WATER The lowest of the low waters (or single low water) of any specified tidal day due to the declinational effects of the <MOON> and <SUN>, where low water is the minimum height reached by a falling <TIDE>; lower low water [TCG, "lower low water (LLW)"]. For tidal datum computational purposes, the minimum height is not considered a low water unless it contains a tidal low water. 22 IR [FACC, Annex B, VDC:6]  
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_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 APPROX_LOWEST_ASTRONOMICAL-
_TIDE		 An approximate level, usually within 0,3 metres from that of <<<LOWEST_ASTRONOMICAL_TIDE>>>. 1 IR [S57A, Attribute, VERDAT:10] [FACC, Annex B, VDC:94]
STD
2005/06/07		 SOUNDING_DATUM_TYPE NEARLY_LOWEST_LOW_WATER A level approximating the lowest water level observed at a <LOCATION>, usually equivalent to <<<INDIAN_SPRING_LOW_WATER>>>; nearly lowest low water. 42 IR [S57A, Attribute, VERDAT:11] [FACC, Annex B, VDC:95]
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 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 APPROX_MEAN_LOW_WATER An approximate level, usually within 0,3 metres from that of <<<MEAN_LOW_WATER>>>. 3 IR [S57A, Attribute, VERDAT:14] [FACC, Annex B, VDC:96]
STD
2005/06/07		 SOUNDING_DATUM_TYPE APPROX_MEAN_LOWER_LOW-
_WATER		 An approximate level, usually within 0,3 metres from that of <<<MEAN_LOWER_LOW_WATER>>>. 4 IR [S57A, Attribute, VERDAT:15] [FACC, Annex B, VDC:97]
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]  
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