是时候重新审视这个问题，因为很多答案都已经变了以及一些基准线已经偏移了(向前)。
It's time to revisit that, as many of the answers have changed and the baseline has moved (forward).
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。
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.
应用数学演绎推理法证明了这种基准使位置误差偏移值最小，又符合实际装配工作条件，比较理想。
Mathematical derivation proves that the reference makes the offset of position error more small, and accords with the running condition of practical fixation, which is more ideal.
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