This paper puts forward, in the point, gravimetric geoid method, geometric geoid method and synthesis method to transform ellipsoid height into orthometric height.
基于此，扼要提出应用重力大地水准面法、几何大地水准面法和综合法将GPS椭球高改化为正高的方法。
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The accuracy of Orthometric Height will be directly affected by ellipsoidal height precision during GPS height transformation, therefore, the detection of gross error is very important.