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《Chinese Journal of Geophysics》 2003-01
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GEOID DETERMINATION ON CHINA SEA AND ITS MERGE WITH THE GEOID IN CHINA MAINLAND

CHEN JUNYONG 1 LI JIANCHENG 2 CHAO DINGBO 2 NING JINSHENG 2 1 State Bureau of Surveying and Mapping, Beijing 100830,China 2 Wuhan University,Wuhan 430070,China  
Geoid determination on the China Sea is conducted by calculating deflection of the verticals obtained from satellite altimeter data, inversely solving Molodensky formula. In order to examine the accuracy of the geoid two measures have been applied. Firstly the gravity anomalies are computed by using the same data set of the deflection of the verticals with the inverse Vening Meinesz formula. Then the obtained gravity anomalies are compared with the real measured gravity data on the sea for external examine. Secondly the geoid on the China Sea is also computed on the basis of the gravity anomalies and Stokes formula. The comparison of the two geoids is internal examine. The mean square errors of the external and internal examines are ±9mGal and ±0.025m, respectively. Geoid on the land is determined by gravity and GPS leveling data, and geoid on the sea is determined mainly by altimeter data. If the two geoids are merged together, then the difference, mainly systematic error, between the two kinds geoid can be usually found. This phenomenon and its main causes are discussed and the so-called extended merge technique is suggested in the paper, especially this technique is suitable to those coastal and shallow sea areas with sparse gravity data. The results of the computation with this technique demonstrate that the systematic error has been reduced well in the merge between the geoids of China mainland and China Sea.
【Fund】: 国家测绘局测绘科技发展基金项目 (C950 4 0 1 ) .
【CateGory Index】: P229.2
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