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《Geotechnical Investigation & Surveying》 2004-02
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The Application of Earth Gravity Field in GPS Height Transformation

Lu Boxiang et al.  
This paper deals with the application of earth gravity field model in GPS height transformation in order to decrease the demand in bench marks.The method used can be summarized as follows:choosing a fitting function;computing the height anomaly difference of each GPS vector by earth gravity field model as observation value;taking height anomaly of the bench mark observed by GPS as fixed value;and thus,processing the fitting.The results of case study shows that the accuracy of 30L can be satisfied when length of surveying section is less than 50 km and only two bench marks are used.
【CateGory Index】: P228.4
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