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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Relative accuracy of regional gravimetric geoid determination is estimated by an frequency domain analysis, which is determined by regional terrestrial gravity measurements and geopotential model.

以频域解析方法，研究由地面重力数据、全球位模型确定区域重力大地水准面的相对精度估计。

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