位场向下在不同深度上解析延拓的值构成延拓场，可对延拓场进行主成份分析。
The values of analytical continuation at different depths from the potential field downward constitute the continuation field, on which the principal component analysis is made.
因延拓深度有限，现有的位场向下延拓方法不能从航磁资料向下延拓出海面的磁场。
The existing methods of downward continuation of potential fields con not be used to continue the aeromagnetic data to the sea level because of the limited continuation depth.
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