On the National Projects for Surveying and Mapping Datum in the Twelfth Five Year Plan of China

Considering the rapid development of economy and society in China,as well as the great progress in space and information technology,the digital surveying and mapping towards information surveying and mapping will be carried out in the 12th Five Year Plan of China.In horizontal datum,base on the Chinese Geodetic Coordinate System 2000,the national continuous operation reference station networks should be completed.It is necessary to form the enough and rational distributed control points for the national geodetic coordinate frame,and it can also help all trades and professions to complete the transformation task of geocentric 3D coordination system.In vertical datum,the task for measuring the 3rd National 1st order leveling network should be completed.Combing with GPS leveling and satellite altimeter,the Chinese geoid of 5 resolution and cm magnitude accuracy should be calculated.