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Federal
Vertical Datum Transformation recent views
National Oceanic and Atmospheric Administration, Department of Commerce —
VDatum is a free software tool being developed jointly by NOAA's National Geodetic Survey (NGS), Office of Coast Survey (OCS), and Center for Operational... -
Federal
Geoid Height and Deflections of the Vertical Models - National Geospatial Data Asset (NGDA) Geoid Models NGDA recent views
National Oceanic and Atmospheric Administration, Department of Commerce —
In Gauss' words, the geoid is "the mathematical figure of the Earth". This figure is an equipotential surface coincident with the idealized mean sea surface. The...