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.
由于配备IMU/DGPS系统，在一定的基站范围内可以在无控制或少量控制点的情况下进行空三平差，极大地减轻了摄影测量外业控制工作量，缩短了生产周期，提高了作业效率。
With IMU/DGPS system, it can process bundle adjustment successfully with less GCPs or even without GCPs with a GPS base station located in a certain scope.
大陆上的现有三角测量系统还须平差。
Existing continental triangulation systems also still need to be adjusted.
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