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Defines the origin of an engineering coordinate reference system.
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Defines the location and precise orientation in 3-dimensional space of a defined ellipsoid
(or sphere) that approximates the shape of the earth.
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Defines the origin of an image coordinate reference system.
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A temporal datum defines the origin of a temporal coordinate reference system.
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A textual description and/or a set of parameters identifying a particular reference level
surface used as a zero-height surface.
Returns an arbitrary
datum from a code.