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Title: Evaluation of geo-potential models EGM96, WDM94 and GPM98CR in Hong Kong and Shenzhen
Authors: Luo, ZC
Chen, Y 
Issue Date: 2002
Publisher: Hong Kong Institution of Engineering Surveyors
Source: Journal of geospatial engineering, 2002, v. 4, no. 1, p. 21-30 How to cite?
Journal: Journal of geospatial engineering 
Abstract: To select the best geo-potential model for the determination of Hong Kong and Shenzhen local geoids, three models - EGM96, WDM94 and GPM98CR - were tested in the region using GPS/leveling data and gravity measurements. The data include GPS/leveling observations at 43 stations, 640 gravity measurements covering the whole territory of Hong Kong, and 62 high precision GPS/leveling observations and 4870 gravity observations in Shenzhen. The results show that the geoid undulations from these geo-potential models contain systematic errors both in Hong Kong and in Shenzhen. After the biases are removed using GPS/leveling data, the STD of geoid undulation differences for EGM96, WDM94 and GPM98CR are 0.039m, 0.037m and 0.030m respectively in Hong Kong, and 0.052m, 0.032m and 0.095m in Shenzhen. While the STD of gravity anomaly differences for EGM96, WDM94 and GPM98CR are 14.136mGal, 13.559mGal and 15.130mGal respectively in Hong Kong, and 8.815mGal, 8.545mGal and 11.567mGal in Shenzhen, it is clear that the WDM94 model is the best of the three.
ISSN: 1563-3772
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