en2015-08-18 17:18 PM CESThttp://inspire.ec.europa.eu/codelist/VerticalReferenceValue:1http://inspire.ec.europa.eu/codelist/VerticalReferenceValueValues indicating the reference level of the vertical extent.en2015-08-18 17:51 PM CESThttp://inspire.ec.europa.eu/codelist/VerticalReferenceValue/groundLevel:1http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/groundLevelThe Earth’s surfaceen2015-08-18 17:51 PM CESThttp://inspire.ec.europa.eu/codelist/VerticalReferenceValue/lowestAstronomicalTide:1http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/lowestAstronomicalTideThe lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.en2015-08-18 17:51 PM CESThttp://inspire.ec.europa.eu/codelist/VerticalReferenceValue/meanSeaLevel:1http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/meanSeaLevelThe 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.en2015-08-18 17:51 PM CESThttp://inspire.ec.europa.eu/codelist/VerticalReferenceValue/seafloor:1http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/seafloorThe bottom of a sea or ocean.