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The Ellipsoid<br />
The Geoid is a complicated surface defined by infinite<br />
number of observed gravity points, hence not suitable to<br />
perform mathematical computations.<br />
The ellipsoidal surface is smooth and convenient for<br />
mathematical operations.<br />
Therefore ellipsoid is widely used as the reference surface<br />
(datum) for horizontal coordinates in geodetic network.<br />
2/15/2012 9
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