Vertical Reference
http://inspire.ec.europa.eu/codelist/VerticalReferenceValue
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ground level
The Earth’s surface
CodeListValue
lowest astronomical tide
The lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.
CodeListValue
mean sea level
The 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.
CodeListValue
seafloor
The bottom of a sea or ocean.
CodeListValue
CodeListValue