有多种方式来定义地面坐标系统；有一些在某些用途方面比其他的更好。
There are multiple ways to define a coordinate system for Earth coordinates; some are better for particular purposes than others.
为保证矿业权核查工作的准确性，坐标系统的选择及地面控制测量显得尤为重要。
The choice of coordinate system and ground control surveying are critical to the accuracy of the checking work.
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.
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