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geoid-ellipsoid separation - [geodesy] The distance from the surface of an ellipsoid to the surface of the geoid, measured along a line perpendicular to the ellipsoid. The separation is positive if the geoid lies above the ellipsoid, negative if it lies below.
[Category=Geospatial ]
Source: esri, 29 April 2012 09:53:45, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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