Research on the 1985 National Elevation Datum and the results obtained are highlighted.
阐述了1985国家高程基准研究工作和成果。
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。
The Beijing Fundamental Bench Mark (BFBM) is an important reference datum in the elevation control network in China.
北京水准原点是我国高程控制网中的一个重要基准点。
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。
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。
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