如果选择不同的基准面，相应的速度分析和叠加结果也会不同。
If selecting different datum, the corresponding results of velocity analysis and stack are different too.
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.
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