NOAA Manages the National Spatial Reference System

geodetic (latitude, longitude, and ellipsoid and orthometric heights) in the official U.S. datums, currently, the North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88); n. geopotential; n. acceleration of gravity; National Geodetic Survey . Positioning America for the Future. geodesy.noaa.gov. n ................
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