高程基准面 altitude datum; datum for heights; datum of elevation; elevation datum 黄海高程基准面 yellow sea datum ..
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datum elevation of pump 水泵基准面
The precondition of RG line being as datum of time-depth conversion is that the RG line is equivalent to the smooth line of surface elevation.
RG线作为时深转换基准面的前提是RG线等效于地表高程的平滑线。
Actually, floating datum is still horizontal datum, but the datum elevation of different CMP is variable.
实际上浮动基准面还是水平基准面，只是不同CMP的水平基准面高程可以变化。
The transforming of survey datum and the control of axis, vertical level, elevation are of great importance on controlling quality of high-rise building construction.
在高层及超高层建筑工程中，测量基准传递和轴线、垂直度、高程控制是建筑物施工质量控制的重点内容之一。
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