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.
采用外延的方法修正灰度设置的偏移可以对多重分形谱有所改善。
An extending method is here used to correct the deviation of gray level setting-up so as to improve the multifractal spectrum.
结果表明，谱峰偏移大为减小。
Results indicate that the peak shifting of the spectrum is reduced.
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