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基于江西大余西华山钨矿区的多种围岩蚀变矿物及其在TM影像多光谱谱带的特征光谱分析,采用波段比值的方法对蚀变信息进行增强处理.用TM 3/TM 2波段比值增强黄铁矿和黄铜矿信息,用TM 4/TM 3和TM 5/TM 7波段比值增强绿泥石、绢云母和方解石信息;对已有的Crosta主成分分析法进行改进,将信息增强后的比值波段数据应用于Crosta法则,对西华山钨矿地区进行蚀变信息提取.经已知钨矿床(点)验证分析,证明上述方法能够有效地提取蚀变信息并识别研究区内主要矿物,提取结果可靠,可为蚀变异常提取工作提供参考.“,”Based on several altered rocks in Xihua mountain tungsten ore of Dayu,Jiangxi province and the rock's spectral characteristics existing in multiple bands of TM image,the methods of band ratio were adopted to enhance the mineral alteration information.The band ratio of TM 3/TM 2 were used to enhance the chalcopyrite and pyrite information,band ratio of TM 4/TM 3 and TM 5/TM 7 was used to enhance chlorite,muscovite and calcite information;to improve the existing method of Crosta principal component analysis,the combination of the enhanced band ratio was applied to Crosta method to extract the alteration information of the Xihua mountain tungsten ore area.Validated by known tungsten ore locations,the methods mentioned above are to be proved that they can effectively extract the alteration information and distinguish the main minerals in the study area.The results are credible,so as to supply the references to the extraction of alteration information.