datum surface

基本解釋

Select planar surface or datum plane.
任意選擇一個平面。
In order to establish the datum surface before precisely grinding inner surface, it is necessary to reconstruct of the free curved surface according to the measurement data.
加工前實際內(nèi)廓型面是按需去除的基準(zhǔn)，故必須先對內(nèi)廓面進(jìn)行測量，再根據(jù)測量型值點重構(gòu)出內(nèi)廓型面，建立精密修磨的相對參考基準(zhǔn)。
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.
本文還給出了根據(jù)（靜校正的）CMP基準(zhǔn)面計算地表圓滑面的方法，統(tǒng)一了深度域中速度譜、時深轉(zhuǎn)換和深度偏移的基準(zhǔn)面。