提取蚀变信息时TM影像的最佳波段组合研究

多光谱数据的最佳波段选择直接影响图像的目视解译和信息提取。在分析TM影像各波段间的标准差、相关系数和最佳指数因子内在联系的基础上,提出采用最佳指数因子与蚀变信息光谱特征相结合的方法选择遥感影像的最佳波段组合。研究表明,最佳指数因子与蚀变信息光谱特征相结合是多光谱数据最佳波段选择的理想方法;TM4＋TM5＋TM7波段组合获取的合成图像构造清晰,岩性差异显著,最有利于蚀变信息的提取。

Study on Optimal Bands Composite of TM Image While Extracting Alteration Information

Visual interpretation and information extraction of remote sensing image were directly influenced by the selection of optimal bands of multispectral data.Based on the relationships of bands of TM image among standard deviation,related coefficient and optimal index factor,the method of optimal index factor combined with spectral signature of alteration information was showed to select the optimal bands composite of remote sensing image.The result showed that optimal index factor combined with spectral signature of alteration information was the best way to select the optimal bands composite of multispectral data;structure and lithology of the composite image,which was extracted with the band composite TM4＋TM5＋TM7,was clear and different,respectively;band composite TM4＋TM5＋TM7 was propitious to extract alteration information.