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选择一个合理的地质剖面，通过蚀变带与逐个岩性特征波谱向量的比较，可以求出提取蚀变带信息的ＴＭ图像最佳波段组合。这种方法要通过蚀变带与其它岩性的波谱向量相似系数和向量模量差所构成的ｑ－τ图解来实现，将波谱向量ｑ－τ图解应用于滇西某金矿区，证明该方法对选择突出蚀变带最佳合成图像有意义
By choosing a reasonable geological profile, the best band combination of TM images for extracting alteration information can be obtained by comparing the alteration bands with the lithographic characteristic vectors one by one. This method is realized by the q-τ diagram formed by the similarity coefficient of spectral vector and the difference of vector modulus between alteration zone and other lithologies. The q-τ diagram of spectral vector q-τ is applied to a gold mining area in western Yunnan Province. The method is significant for choosing the best synthetic image for highlighting the alteration zone