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《REMOTE SENSING FOR LAND & RESOURCES》 1998-02
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THE METHOD OF AbstractING REMOTE SENSINGINFORMATION OF ALTERATED ROCKS INTHE UNCOVERED BEDROCKS AREA

Zhang Yujun(AGRS, Ministry of Land and Resources, Beijing 100083)Yang Jianmin(Institute of Mineral Deposits, Chinese Academy of Geological Scinces, Beijing 100037)  
he in-situ sampling and the on-image sampling have confirmed that in Liugouxia area the altered rocks, being closely related to metallic mineralization, are characterized by the double peaks on the reflective spectra curves (high reflection in TM3 and TM5 bands). This provides the prerequisite for abstracting the information of the alteration rocks from the remote sensing image. This paper, by studying the method of abstracting the alterated rocks information, demostrates that the method of PCA (using TM1+TM2, TM4/TM3, TM5,TM7) is the best for the information abstraction. This method can be called modified Crosta method. Among the 103 deposits located in the 9 000 square kilometers area, there are 86 deposits that have the corresponding alteration anomalies on the anomaly image is obtained by the modified Crosta method. The coincidence coefficient is as high as 83.5%. Another 115 new targets were predicted according to this anomaly image and rock types as well as structrural conditions.
【Fund】: 国家计委科技找矿项目
【CateGory Index】: TP751
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