At present, GPS plane control net is widely applied, but the GPS elevation is not used widely. The people expect that the GPS elevation surveying can take the place of the conventional leveling.

当前，GPS平面控制网已经得到了广泛的运用，但是GPS高程却运用得不够，人们期望着能够用GPS高程测量代替传统的水准测量。

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The distribution of the GPS leveling points obviously affects the accuracy of interpolated GPS height.

水准联测点的分布状况对GPS高程的拟合精度有明显影响。

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The unreasonably distributed GPS leveling points make some GPS points have too big extrapolated distance, which causes the extrapolated points have too low accuracy.

水准联测点分布不合理，使某些拟合点的外推距离太大，导致外推点的精度太差。

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