EGM2008地球重力场模型在中国大陆适用性分析_章传银.pdf

38 　4 　　　 Vol.38, No.4 　2009 8 Acta Geodaetica et Cartographica Sinica Aug., 2009 　　 :1001-1595 (2009)04-0283-07 EGM 2008 1 2 3 1 2 章传银, 郭春喜 , 陈俊勇 , 张利明, 王　斌 1., 100039;2. , 7 10054;3., 100830 EGM 2008 and Its Application Analysis in Chinese Ma inland 1 2 3 1 2 ZHANG Chuanyin , GUO Chunxi , CHEN Junyong , Z HANG iming , WANG Bin 1.Chinese Academy of Surveying and Mapping, Beij ing 100039, China;2.Geodetic Dat a Processing Center, State Burea u of Sur- veying and Mapping, Xi a n710054, China;3.St ate Burea u of Surveying and Mapping, Beijing 100830, China Abstract :Using GPS-leveling data and surface mean free-air gravity anomalies respectively in mainland China, we had tested the precision of Ea rth Gravity Model 2008 (EGM2008).Based on the test results, some conclusions have been drawn as follows:① The accuracy of EGM2008 height anomalies achieves 20 cm in mainland, 12 cm in Cen- tral-East China, and even 9 cm in North China;② The general accuracy of EGM 2008 free-air gravity anomalies is -3 2 10.5 mGal (1 mGal=10 cm/s )in China;③ The EGM2008 accuracy is very high and its global precision is similar to the Chinese mainland s;④ Compared with WDM 94, QDMseries and EGM96, the accuracy of EGM 2008 height anomalies is increased by 3 ～ 5 times, also by above 2 times compared with IGG05b and EIGEN-5c, especially in gravity anomalies.Based on the resea rch of EGM 2008, it has been significantly improved to have the better under- standing of gravity field structure in China, especially in west China.Therefore, suggestions are made on construc- ting (Ultra-)high gravity model of best fitting Chinese gravity field by combination of different national sector latest data and re-computing National (quasi-)geoid on the basis of EGM200