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horizontal datum[geodesy] A horizontal datum provides a frame of reference as a basis for placing specific locations at specific points on the spheroid. A datum is the model that is used to translate a spheroid into [..]
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horizontal datumA reference for specifying positions on the Earth's surface. Each datum is associated with a particular reference spheroid. Positions referred to different datums can differ by several hundred me [..]
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horizontal datuma base measuring point ("0.0 point") used as the origin of rectangular coordinate systems for mapping or for maintaining excavation provenience.
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