介绍了GPS高程的应用理论，大地水准高的计算方法以及利用曲面拟合法计算大地水准面高，并对结果进行了分析，绘制出高程异常等值线图。
The paper introduces the application theory of GPS height and both the general method and the curved surface fitting method to measure geodetic height.
然后，从背景曲面的边界到内部逐个地搜索定义于背景曲面上某物理量的等值点，并按一定的规则将其连成等值线；
We searched each grid for picking up the 3D point position on which the quantity was equal to the designated contour level. Then these special points were connected in some contours according …
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