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GPS, normal height, geodetic height, non-grid data, terrain effect.
正常高，大地高，非格网数据，地形影响。
The paper introduces the application theory of GPS height and both the general method and the curved surface fitting method to measure geodetic height.
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。
It is more difficult to confirm the transformation relationship between geodetic height and normal height. This is main reason of restricting application of GPS height into use.
指出GPS大地高与正常高之间的转换关系较难确定是限制GPS高程应用的主要原因。
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