The key of GPS leveling across sea is that the height datum on each side of channel is not consistent, so the general geometrical fitting method can not be used directly.
GPS跨海水准的关键问题是海峡两侧的高程基准不一致，因此无法采用常规的数值拟合方法。
The key of GPS leveling across sea is that the height datum on each side of channel is not consistent, so the general geometrical fitting method can not be used directly.
GPS跨海水准的关键问题是海峡两侧的高程基准不一致，因此无法采用常规的数值拟合方法。
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