准线基准线基准面基线 datum line
基准特征与基准平面 Datum Plane
海图基准面海图基准面 sounding datum
基准平面与基准轴 DATUM-PLANE-AXIS ; AXIS
根据特征元素树创建了基准面和基准坐标系，使我们很方便的在需要参照基准的时候来选取它。
According to feather element tree, the base level and base coordinate system are created, then we can choose them when we need them at any time.
基准面的变化是构造、气候的函数，对于地史时期的滨海盆地，基准面就是相对海平面。
Base level was the function of tectonic movements and climate circles, and base level for coastal basin in geological history was relative sea level.
浮动基准面方法是将相对固定基准面的一份静校正量分解成两部分，并分别在动校正前、后应用的一种处理手段，这种分解是以CMP道集为单位的。
Floating datum method is divide the static of relative fixed datum into two parts that are applied to seismic data before and after NMO respectively and the division is done on CMP gather.
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