North American Datum 1983 (NAD83)

North American Datum 1983 (NAD83)

The North American Datum 1983 (NAD83) is a geocentric datum that was established in 1986 for the United States, Canada, Mexico, Central America and the Caribbean Islands. Hawaii and Greenland were also connected to this datum. It is based on a horizontal adjustment of conventional survey data and the inclusion of Transit Satellite Doppler data and Very Long Baseline Interferometry (VLBI) data. The global Doppler and VLBI observations were used to orient the NAD83 reference frame to the BIH Terrestrial System of 1984. The orientation of the ECEF coordinate axes of the NAD83 reference frame is identical to that of the original  WGS84 reference frame.


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