The Unified WGS Solution, as stated above, was a solution for geodetic positions and associated parameters of the gravitational field based on an optimum combination of available data.
2.
RFC 4119 provides a container for both geodetic position and civic address information ( now updated by RFC 5139 ) and also defines elements for expressing a user's privacy preferences.
3.
The CORS station has a definitely known geodetic position and is used with other CORS stations for sub-meter GPS differential correction through the OPUS ( Online Positioning User Service ) service.
4.
The North American Datum of 1927 ( NAD 27 ) is " the horizontal control datum for the United States that was defined by a location and azimuth on the Clarke spheroid of 1866, with origin at ( the survey station ) Meades Ranch ( Kansas ) . " . . . The geoidal height at Meades Ranch was assumed to be zero, as sufficient gravity data was not available, and this was needed to relate surface measurements to the datum . " Geodetic positions on the North American Datum of 1927 were derived from the ( coordinates of and an azimuth at Meades Ranch ) through a readjustment of the triangulation of the entire network in which Laplace azimuths were introduced, and the Bowie method was used . " ( http : / / www . ngs . noaa . gov / faq . shtml # WhatDatum ) NAD27 is a local referencing system covering North America.
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