Application of Accurate Inspection of CQG2000 Quasi-Geoid Model to Regional Gravity Survey in Qinghai-Tibet Plateau

During regional gravity survey,accuracy of orthometric height may affect the accuracy of gravity survey directly.With CQG2000 quasi-geoid model,or thometric height with higher accuracy can be acquired through calibrating geodetic altitude measured by GPS.However,the accuracy and resolution of CQG2000 quasi-geoid model are different in different areas and become worse in Qinghai-Tibet plateau. The field test in Qinghai-Tibet plateau show that the accuracy of CQG2000 quasi-geoid model can satisfy the accuracy of orthometric height during the the 1:200000 regional gravity survey.Based on the test,we summarize the method how the accuracy of height measurement can be improved by GPS with CQG2000 quasi-geoid model during the regional gravity survey,which may be helpful to regional gravity survey.