海面倾斜与高程基准密切相关，它已经受到大地测量学界和海洋学界的重视。

There is a close correlation between sea level slope and height datum, in which geodesylists and oceanographers are interested.

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就长距离超高压送电线路工程的GPS测量中如何选择大地水准面模型，如何确定GPS测量的高程等问题进行了讨论。

This paper has discussed how to select geoidal model and how to determine normal height in GPS survey of long distance transmission line project.

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如何将GPS大地高转化咸水准高程，并使其保持一定的精度，一直是人们研究的热点。

So it's always a hot topic how to transform GPS ellipsoidal height into level elevation and to keep certain accuracy.

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