The reason why GPS leveling cant be used for height transfer across obstacle is that the height datum of both sides of obstacle is not consistent.
GPS水准无法直接应用于跨障碍高程传递，其关键原因在于障碍物两侧的高程基准不一致。
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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