Abstract
Molodenskii M.X. had raised a Quasigeoid surface for making a display of normal height from the Earth physical surface by perpendicur to the Ellipsoid. However in literature of heigh Geodesy there are different explanations about thi surface, even it seems to be only product of normal height definition process on the the Earth physical surface. This scientific report will show that the Quasigeoid is a image of the Geoid with real potencial W = W0 in the Earth normal gravitational field and closely related to this Geoid. So we can see a relationship between the Quasigeoid and Geoid on the sea and ocean, and must reconsider a point of view about zero normal height on the sea and ocean. Research results in this article will determine scientific bases for perfection of the state height system.
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