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《Journal of Geodesy and Geodynamics》 2008-04
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CHINESE MODERN GEODETIC DATUM SUITABLE FOR DYNAMIC EARTH AND INFORMATION ERA

Chen Junyong(State Bureau of Surveying & Mapping,Beijing 100830)  
The modernization progress of geodetic datum in Japan,Korea,Mongolia,New Zealand,and Malaysia is concisely introduced.The present situation of Chinese geodetic coordinate system and frame is reviewed.The definition and geodetic fundamental constants of Chinese geocentric 3D coordinate system(CGCS2000)is introduced,which will be employed since 2008 July 1st.The corresponding coordinate frame with CGCS2000 is discussed.The necessary conditions for the frame to realize the CGCS 2000 are enough number,proper density and high accuracy of national GNSS continuously operating stations and national geodetic control points.The former has not yet been established till now,and the latter contains the 2000 national GPS network and the national astro-geodetic network batch adjusted with the GPS network mentioned.The influences on the current existing Chinese maps with various scales,especially the topographic map,caused by the change,such as the changes of latitude,longitude,Gauss plane coordinates of the surface points and their projection on the map of the coordinate systems are discussed.The variation of the orientation and the length of the lines between the points on the map(including map outlines)are given in numerical cases as well.
【CateGory Index】: P226.3
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