US Geodesy group within NOAA

Summary:	US Geodesy group within NOAA The National Spatial Reference System (NSRS), defined and managed by the National Geodetic Survey (NGS), is a consistent national coordinate system that specifies latitude, longitude, height, scale, gravity, and orientation throughout the Nation, as well as how these values change with time.
Web Link:	Go to National Geodetic Survey at NOAA

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