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\end{enumerate}  we propose an edge detection method based on the analysis of eigenvalues of GGT.\begin{quote}  Considering the actual geological situation;  \end{quote} Considering the actual geological situation, the positive and negative density bodies usually coexist simultaneously. The proposed \href{http://www.baidu.com}{www.bacom}method \href{http://www.hao123.com}{www.baidu.com}method  has designed to outline the positive/negative density bodies with the corresponding values.