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《Acta Geodaetica et Cartographica Sinica》 2012-05
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The Recent Chinese Terrestrial Digital Height Datum Model: Gravimetric Quasi-Geoid CNGG2011

LI Jiancheng School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China  
The status and development background on the research of the local geoid of the world in the recent 20 years is reviewed in this paper.An updated 2′×2′ digital quasi-geoid model(CNGG2011) for the National Height Datum 1985 of China is computed by using Stokes-Helmert method.More than one million land gravity measurements,7.5″×7.5″ digital elevation data from SRTM,and 649 order B GPS/leveling data are used in the computation of CNGG2011.The average accuracy of CNGG2011 is ±0.13 m in China,and ±0.07 m and ±0.14 m in eastern and western China,respectively.The average accuracy in each province is ±0.06 m,and they are ±0.05 m and ±0.11 m in the East and the West of China respectively,and it is ±0.22 m in the Tibet area.The relationship between the gravimetric geoid and the GPS/leveling is also discussed and some strategies for geoid refinement in the future are also proposed for National Height Datum in China.
【Fund】: 国家自然科学基金(41210006;40637034);; 国家创新研究群体科学基金(41021061)
【CateGory Index】: P228.4
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