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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 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 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 APPROX_MEAN_LOW_SPRINGS An approximate level, usually within 0,3 metres from that of <<<MEAN_LOW_SPRINGS>>>; approximate mean low water springs. 2 IR [S57A, Attribute, VERDAT:7] [FACC, Annex B, VDC:92]
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_SEA_LEVEL An approximate level, usually within 0,3 metres from that of <<<MEAN_SEA_LEVEL>>>. 5 IR [S57A, Attribute, VERDAT:19] [FACC, Annex B, VDC:98]
STD
2005/06/07
SOUNDING_DATUM_TYPE CHART_DATUM_UNSPECIFIED Chart <SURFACE_DATUM> is unspecified. 6 IR [FACC, Annex B, VDC:21]  
STD
2005/06/07
SOUNDING_DATUM_TYPE EQUINOCTIAL_SPRING_LOW-
_WATER
The level of <<<LOW_WATER_SPRINGS>>> near the time of an equinox; equinoctial spring low water. 7 PR [S57A, Attribute, VERDAT:22]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HGHR_HIGH_LARGE_TIDE The mean of the <<<HIGHEST_HIGH_WATER>>>s, one from each of 19 years of observations; higher high water large tide. 8 PR [S57A, Attribute, VERDAT:28]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HGHR_HIGH_WATER The highest of the <<<HIGH_WATER>>>s (or single <<<HIGH_WATER>>>) of any specified tidal day due to the declinational effects of the <MOON> and <SUN>; higher high water [TCG, "higher high water (HHW)"]. 9 IR [FACC, Annex B, VDC:3]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HIGHEST_ASTRONOMICAL-
_TIDE
The highest <<TIDE_LEVEL>> that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions; highest astronomical tide. 12 PR [S57A, Attribute, VERDAT:30]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HIGHEST_HIGH_WATER The highest water level observed at a <LOCATION>; highest high water. 13 IR [FACC, Annex B, VDC:28]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HIGHEST_NORMAL_HIGH-
_WATER
Highest normal <<<HIGH_WATER>>>. 14 IR [FACC, Annex B, VDC:26]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HIGH_WATER The highest level reached at a <LOCATION> by the <WATERBODY_SURFACE> in one tidal cycle; high water. When used on <INLAND_WATER>s, high water is generally defined as a level that the daily mean water level exceeds less than 5 percent of the time. 10 PR [S57A, Attribute, VERDAT:18]  
STD
2005/06/07
SOUNDING_DATUM_TYPE HIGH_WATER_SPRINGS An arbitrary level, approximating that of <<<MEAN_HIGH_SPRINGS>>>; mean high water springs. 11 PR [S57A, Attribute, VERDAT:20]  
STD
2005/06/07
SOUNDING_DATUM_TYPE IGLD_1985 A vertical reference system with its zero based on the mean water level at Rimouski/Pointe-au-Père, Québec, over the period 1970 to 1988; International Great Lakes Datum 1985. 15 PR [S57A, Attribute, VERDAT:25]  
STD
2005/06/07
SOUNDING_DATUM_TYPE INDIAN_SPRING_HIGH_WATER A <<TIDAL_DATUM>> approximating the level of the mean of the <<<HGHR_HIGH_WATER>>> at <SPRING_TIDE>s; Indian spring high water. This <<TIDAL_DATUM>> approximates the highest water level observed at a <LOCATION> and is usually above that of the <<<HGHR_HIGH_WATER>>> at <SPRING_TIDE>s. 16 IR [FACC, Annex B, VDC:30]  
STD
2005/06/07
SOUNDING_DATUM_TYPE INDIAN_SPRING_LOW_WATER A <<TIDAL_DATUM>> approximating the level of the mean of the <<<LOWER_LOW_WATER>>> at <SPRING_TIDE>s; Indian spring low water. This <<TIDAL_DATUM>>, which is also known as Indian tidal plane, approximates the lowest water level observed at a <LOCATION> and is usually below that of the <<<LOWER_LOW_WATER>>> at <SPRING_TIDE>s. 17 IR [S57A, Attribute, VERDAT:8] [FACC, Annex B, VDC:4]
STD
2005/06/07
SOUNDING_DATUM_TYPE LOCAL_DATUM An arbitrary <DATUM> defined by an authority of a local <HARBOUR>, from which levels and tidal heights are measured by this authority; local datum. 18 PR [S57A, Attribute, VERDAT:24]  
STD
2005/06/07
SOUNDING_DATUM_TYPE LOWER_LOW_LARGE_TIDE The mean of the <<<LOWEST_LOW_WATER>>>s, one from each of 19 years of observations; lower low water large tide. 21 PR [S57A, Attribute, VERDAT:27]  
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 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]
STD
2005/06/07
SOUNDING_DATUM_TYPE NEARLY_HIGHEST_HIGH An arbitrary level approximating the highest water level observed at a <LOCATION>, usually equivalent to the <<<HIGH_WATER_SPRINGS>>>; nearly highest high water. 41 PR [S57A, Attribute, VERDAT:29]  
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 SPRING_TIDE <SPRING_TIDE>. 43     [FACC, Annex B, VDC:18]

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