Geodetic datum
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A geodetic datum or geodetic system is a global datum reference or reference frame for unambiguously representing the position of locations on Earth by means of either geodetic coordinates or geocentr
City of Chicago Datum Benchmark
North American Datum
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The North American Datum is the horizontal datum used to define latitude and longitude in North America. A datum is a formal description of the shape of the Earth along with survey markers serving as
Geodetic datum
…of the shape of the Earth ellipsoid. The first triangulation across the United States was not completed until 1899. The U.S. survey resulted in the North American Datum (horizontal) of 1927 (NAD 27) and the Vertical Datum of 1929 (NAVD29), the first standard datums available for public use. This was followed by the…
The Meades Ranch Triangulation Station, the fundamental station for the North American Datum of 1927