塔什库尔干地区铁蚀变信息提取研究

The Taxkorgan regional iron alteration information extraction

新疆塔什库尔干地区是我国重要的金属成矿带,气候干燥,植被稀少,很适合遥感工作的进行。本文以Landsat-7的ETM+影像为遥感数据信息源,讲述了卫星遥感技术在该地区地质矿化蚀变信息提取中的运用。针对区内发育的不同蚀变类型,分别采用特征波段比值法和主成分分析法进行遥感影像增强处理,为了更好的显示出蚀变区域我们在这采用了密度分割法来直接处理增强后遥感影像,最后根据野外实际情况比较这两种方法在应用中的优劣势,并最终认为主成分分析法在实际应用中更精确。

Taxkorgan region of Xinjiang is an important metallo- genic belt in China, where＇s climate is dry, vegetation is sparse, and it is suitable for remote sensing work. This paper tell about the using of the satellite remote sensing technology in extracting the geological mineralized alteration information which take use of the Landsat-7 ETM ＋ images as the source data. Taking care of the different alteration types development for the region, respec- tively, we take use the method of the characteristic band ratio and principal component analysis to enhanced the image, and then use the density segmentation method highlights the anoma- lous areas of mineralization and alteration in the image. In the end, according to the field situation to compare the advantages and disadvantages of these two methods in the application. And finally consider that the method of the principal component analysis will be more accurate.