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EGM96 geoid undulations

Project description

egm96

GPS reports altitude as height above the WGS 84 reference ellipsoid, a smooth mathematical surface that can sit tens of meters away from actual sea level. EGM96, the 1996 Earth Gravitational Model from the U.S. National Geospatial-Intelligence Agency, describes where mean sea level lies relative to that ellipsoid. The gap between the two is the geoid undulation; subtracting it from a GPS height gives an approximate height above sea level.

This package looks up the EGM96 undulation for any coordinate.

License

MIT (see LICENSE). EGM96 is a work of the U.S. Government (NGA, NASA, and Ohio State University) in the public domain; the 5′ dataset is redistributed by the MIT-licensed GeographicLib.

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