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Meades Ranch Triangulation Station
The Meades Ranch Triangulation Station is a survey marker in Osborne County〔 in the state of Kansas in the Midwestern United States. The marker was initially placed in 1891; from 1901 to 1989, it was the reference location relative to which all locations on the United States were measured, and from 1913 to 1989, it was the reference location for all surveys in the continent.
==History==
(詳細はgeodetic datum is a point or set of points used to establish a coordinate system. By designating the location of one point, and the direction from that point to a second point, one can establish a system relative to which other points can be located and mapped. As one surveys a larger area over which the curvature of the Earth becomes significant, it also becomes necessary to define an ellipsoid: a curved surface that approximates the shape of the Earth in the area of inerest.〔〔
The first nationwide datum in the United States was established in 1879. At that time, a region of contiguous triangulation existed from Maine to Georgia. The New England Datum was chosen with a benchmark in Maryland, near the middle of this region, as the horizontal datum, and a second Maryland mark used to define the azimuth (horizontal) direction.〔 To account for the Earth's curvature, the datum used a model called the Clarke spheroid, developed in 1866.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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