http://inspire.ec.europa.eu/codelist/VerticalReferenceValueINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 17:18 PM CEST2015-08-18 17:18 PM CESTVertical ReferenceValues indicating the reference level of the vertical extent.http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/groundLevel2015-08-18 17:51 PM CEST2015-08-18 17:51 PM CESTground levelThe Earth’s surfacehttp://inspire.ec.europa.eu/codelist/VerticalReferenceValue/lowestAstronomicalTide2015-08-18 17:51 PM CEST2015-08-18 17:51 PM CESTlowest astronomical tideThe lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/meanSeaLevel2015-08-18 17:51 PM CEST2015-08-18 17:51 PM CESTmean sea levelThe average height of the sea at a tide station measured from a fixed predetermined reference level.Ordnance Datum, often used as a reference point for defining vertical heights, uses the mean Sea Level as its reference point and therefore is also included within this value.http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/seafloor2015-08-18 17:51 PM CEST2015-08-18 17:51 PM CESTseafloorThe bottom of a sea or ocean.