Refinement of Quasi-geoid in China and Relevant Problems

This paper discusses the role of refining geoid in the development of contemporary surveying and mapping,and considers that a gridded digital geoid model is really a reference frame in datum sense for orthometric or normal height measurement.The real resolution of the new generation quasi-geoid model CQG2000 in China is analysed in detail,and the accuracy estimates of the model is also described.In addition,the advanced level in geoid refinement abroad is briefly introduced,and the necessity,requirement and possible approach for further refining the quasi-geoid model in China are pointed out.