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molodensky correction

(1) The amount, obtained using Molodensky's formulas, to be added to the length of a geodesic between two specified points on the geoid to obtain the length of the geodesic between the two corresponding points on that ellipsoid taken to represent the geoid. In older methods of calculating coordinates in triangulation networks, the length of the measured base line on the ground was reduced to its equivalent length on the geoid, but this length was then assumed to be the length of the corresponding geodesic on the ellipsoid. The Molodensky correction eliminates this error. (2) The amount (h - h c) to be added to the assumed height h c of the geoid above the ellipsoid to obtain the actual height h, as given by Molodensky's formulas.

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