quaff - U.S. National Geodetic Survey

Reference ellipsoid and geodetic datum of GPS, defined and maintained by the US Department of Defense. Current realizations of WGS 84 are considered identical to ITRF 2000 at the 2 cm level. See National Imagery and Mapping Agency (2000) for details, and Merrigan et al. (2002) for information on the most recent realization. ................
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