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Ellipsoid and Datum, Projection, Coordinate system, and Map Scale

Earth Shape Models. Flat earth models are still used for plane surveying, over distances short enough so that earth curvature is insignificant (less than 10 km). Spherical earth models (Earth centered model) represent the shape of the earth with a sphere of a specified radius. Spherical earth mode

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Ellipsoid and Datum, Projection, Coordinate system, and Map Scale

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