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《Acta Geodaetica et Cartographica Sinica》 2011-04
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China Geodetic Coordinate System 2000:Velocity Field in Mainland China

WEI Ziqing,LIU Guangming,WU Fumei Xi'an Institute of Surveying and Mapping,Xi'an 710054,China  
The definition of the China Geodetic Coordinate System 2000 is identical with that of the International Terrestrial Reference System.The realization of the system is accomplished by two steps.As the first step,the combined adjustment of the Crustal Movement Observation Network of China(CMONC),the Nationwide GPS First and Second Order Network,the National GPS A and B Order Network,and the Crustal Movement Monitoring Network is carried out in ITRF97,achieving consistent coordinates of some 2 600 GPS geodetic points at epoch 2000.0.As the second step,the velocities of 1 070 CMONC stations are obtained through processing the CMONC data of ten years.Furthermore,the velocities of the remaining 1 500 non-CMONC stations are interpolated using known velocities of the CMONC stations.This paper is devoted to the second step of the realization of the system,namely,to studying the determination of the velocity field in mainland China.The results of the velocity field for the mainland China are presented.Four methods for the utilization of the velocity field are proposed,which are the regional Euler vector method,the local Euler vector method,the grid mean value method and the block Euler vector method.The advantages and disadvantages of individual methods are compared and analyzed in terms of the accuracy of velocity and the convenience of use.A 3°×3° grid mean velocity table for mainland China is appended for user's reference.
【CateGory Index】: P227
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