This paper studies the problem on extending the method for fitting between terrestrial gravity quasi-geoid and GPS leveling quasi-geoid to the case of sea area near coast.

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.

Study of surface fitting in quasi-geoid refinement of line project;

Precision of the quasi-geoid for Qingcheng distriot,Qingyuan city;

Determination of regional quasi-geoid using gravity field models and GPS/leveling data;

This paper introduced the establishing process of Beijing geography space frame benchmark system,which included building up space coordinates benchmark,altitude benchmark,quasigeoid and surveying service system based on GPS.

In comparison with the present commonly used fitting methods of the quasigeoid, Bspline fitting principle is discussed and solved by applying the correlate matrix method.

A new model of the gravity and geoid named 2000 China s gravity field and quasigeoid model (CGGM2000) has been established, which is determined with gravity information under the control of GPS/leveling.

Research on the measures of accurating quasi geoid model based on Neural Network;

The Application of Quadric Surface Fitting in Regional Quasi Geoid Refining;

An effective method of region quasi geoid precision examination;