Kansas was selected as a common reference point because it was near the center of the contiguous United States. This datum uses the Clarke Ellipsoid of 1866 with a fixed latitude and longitude at Meade’s Ranch, Kansas. NAD27 uses all horizontal geodetic surveys collected at this time using a least-square adjustment. The North American Datum of 1927 (NAD27) is one of the main three geodetic datums used in North America. All coordinates on Earth are referenced to a horizontal datum. Geodetic datums form the basis of coordinates of all horizontal positions on Earth. Geodesists use a horizontal datum as the model to translate a spheroid/ellipsoid into locations on Earth with latitude and longitude lines. Most historical USGS topographic maps and projects by the US Army Corps of Engineers used NAD27 as a reference system.Ī horizontal datum provides a frame of reference as a basis for placing specific locations at specific points on the spheroid. Overall, it established a network of standardized horizontal positions in North America. NAD27 is the adjustment of long-baseline surveys. NAD27 stands for the North American Datum of 1927. North American Datum 1927 (NAD27)? Meades Ranch Triangulation Station, fundamental station for the North American Datum of 1927
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