Vertical Geodetic Datum

vertical geodetic datum - [geodesy] A geodetic datum for any extensive measurement system of heights on, above, or below the earth's surface. Traditionally, a vertical geodetic datum defines zero height as the mean sea level at a particular location or set of locations; other heights are measured relative to a level surface passing through this point. Examples include the North American Vertical Datum of 1988; the Ordnance Datum Newlyn (used in Great Britain); and the Australian Height Datum.

[Category=Geospatial ]

Source: esri, 27 September 2012 10:58:10, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation