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EA:  TIDAL_DATUM

Status: STD 2005/06/07
Code: 1438
Concept definition: A level of a <WATERBODY> defined by some phase of the <TIDE>, from which water <<DEPTH>>s and <<TIDE_LEVEL>>s are reckoned; tidal datum.
 
Attribute value type: ENUMERATION
Reference type: PR
Reference: [S32, "datum: tidal"]
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		 TIDAL_DATUM MEAN_LOW_WTR The mean height of all the lowest <<TIDE_LEVEL>>s at a <LOCATION> over a 19-year period; mean low water. 9 PR [S32, "mean low water"]  
STD
2005/06/07		 TIDAL_DATUM MEAN_LOW_WTR_NEAPS The mean height of the lowest <<TIDE_LEVEL>> of <NEAP_TIDE>s; mean low water neaps. It is also known as neap low water. 10 PR [S32, "mean low water neaps"]  
STD
2005/06/07		 TIDAL_DATUM MEAN_LOW_WTR_SPRINGS The mean height of the lowest <<TIDE_LEVEL>> of <SPRING_TIDE>s; mean low water springs. It is also known as spring low water. 11 PR [S32, "mean low water springs"]  
STD
2005/06/07		 TIDAL_DATUM 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. 14 PR [S32, "mean sea level"]  
STD
2005/06/07		 TIDAL_DATUM MEAN_TIDE_LEVEL The level midway between <<<MEAN_HIGH_WTR>>> and <<<MEAN_LOW_WTR>>>; mean tide level. It is also known as half tide level, and it may differ slightly from <<<MEAN_SEA_LEVEL>>>. 15 PR [S32, "mean tide level"]  
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