The South American Datum ( SAD ) is a regional historical geodetic datum for South America . The most common version was established in 1969 ( SAD69 ), as adopted by the Pan American Institute of Geography and History .
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1-671: It uses as reference ellipsoid the Geodetic Reference System 1967 (GRS-67), recommended by the International Union of Geodesy and Geophysics in Lucerne in 1967. This ellipsoid acquired topocentric orientation defined at the astrogeodetic vertex Chuá , in the municipality of Uberaba , Brazil. This datum was subsequently adopted by many South American countries, including the earlier Brazilian Geodetic System ( Sistema Geodésico Brasileiro - SGB ). In most countries, SAD
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