在GPS高程转换中，为了减少对已知高程点的需求量，本文引用了地球重力场模型。
This paper deals with the application of earth gravity field model in GPS height transformation in order to decrease the demand in bench marks.
一个经公认的已知值，如基点或海平面的高程，其它点的测量值根据该点的值进行校正。
An agreed and known value, such as the elevation of a benchmark or sea level, to which other measurements are corrected.
为计算地面上具有高程的两点间的大地距离，构造了一个过两已知点的新椭球，确定出了新椭球的有关参数，在此基础上给出了计算大地距离的非迭代法和大椭圆法，并与传统方法进行了精度比较。
In order to calculate the geodetic distance of two points that are far from the refernced ellipsoid, a new ellipsoid which passes the two points is constructed, then its parameters are determined.
为计算地面上具有高程的两点间的大地距离，构造了一个过两已知点的新椭球，确定出了新椭球的有关参数，在此基础上给出了计算大地距离的非迭代法和大椭圆法，并与传统方法进行了精度比较。
In order to calculate the geodetic distance of two points that are far from the refernced ellipsoid, a new ellipsoid which passes the two points is constructed, then its parameters are determined.
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