通过地面网与卫星网的联合平差，以改善网的精度和建立高精度的地心坐标系统，是当前大地测量的一项重要任务。
It is an important mission of Geodesy to improve an accuracy of control networks and to establish the geocentric coordinate system via combined satellite and terrestrial network adjustment.
“2000国家大地控制网”是国家大地测量的重大科学工程项目。
National Geodetic Control Network of China is an important fundamental scientific engineering project in China.
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