http://inspire.ec.europa.eu/codelist/VerticalReferenceValue/meanSeaLevelINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 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.