火星没更海洋,没更海平面,地势起伏, 因此,火星的基准面(datum surface)是人为规定的。基准面是火星地表大气压 为6.107百帕的高度,在概念上与地球以一大气压(1013百帕)为海平面高度类 似。
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common datum surface 公有基准面
Datum Surface Locator 基准面定位器
surface reference datum 地面参考基准面
datum of level surface 水准面基准
The connection can be made by using the running surface of the paved cart as the horizontal datum.
连接时可以利用已铺好的大车运行轨道面作为水平基准。
Surface should be used as a fine datum to be processed first, because the precision of the positioning of the surface is more accurate, the smaller the clamping error is.
用作精基准的表面应先加工出来,因为定位其准的表面越精确,装夹误差就越小。
A method for deriving the smoothed ground surface from CMP datum of static correction is given to form a common datum for velocity spectrum, time-depth conversion and depth migration in depth domain.
本文还给出了根据(静校正的)CMP基准面计算地表圆滑面的方法,统一了深度域中速度谱、时深转换和深度偏移的基准面。
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