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Can a transformation between a sphere or spheroid and a datum be performed?
No geographic (datum) transformation parameters have been calculated to transform data from a datum to a sphere, or from a sphere to a datum. No geographic transformation can be performed between a datum and a sphere.
A datum is defined on an oblate spheroid, which is a flattened oval shape, with a larger radius in the horizontal (equatorial) plane than the vertical (polar) plane. The radius of the spheroid changes continuously from the greatest length at the equator as the radius is measured from the equator to the poles.