National Height Datum 国家高程基准
Fall height datum 坠落高度基准面
On Height Datum 高程基面问题浅议
Falling height Datum 坠落高度基准面
height datum plane crashed 坠落高度基准面
1985 National Height Datum 国家高程基准
reference datum height 基准高度 ; 参考空层高度
height above datum 基准面以上高程
height t datum 高程基准面
There is a close correlation between sea level slope and height datum, in which geodesylists and oceanographers are interested.
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。
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 higher requirement of the former coordinate datum, height datum and gravity datum was in dire need of improvement and update in modernization.
提出了国家地理空间信息基准框架内改进与更新原有的大地坐标基准、高程基准和重力基准的建设道路及解决原则。
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