In the paper,through comparing with the application of serveral geoid models in different area and anal-yzing the accuracy of 1∶10 000 Digital Orthophoto Map Control Point Surveying work in wide area,some useful results that guide to several actual projects can be given.

Using the CQG2000 quasi geoid model developed recently in China,the authors corrected the ellipsoidal height of GPS survey and,as a result,attained a higher accuracy of orthometric altimetric survey.

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;