为了突出有用异常、压制各种干扰,在重磁异常解释工作中经常要进行延拓、求导、化向磁极、磁场各分量之间的转换以及分离区域场和局部场等多种处理。通常把上述处理统称为位场变换。在第一讲中我们已经提到,从频率域看,位场变换就是某种滤波。这一讲的中心内容就是具 In order to highlight the useful anomalies and suppress all kinds of interferences, it is often necessary to carry out the processes of extension, derivation, polarization, magnetic field components conversion, and separation of regional fields and local fields in the interpretation of gravity and magnetic anomalies. This process is generally referred to as a field shift. In the first lecture we have already mentioned that from the frequency domain, the field shift is some kind of filtering. The centerpiece of this talk is just that