ETM+遥感影像铁化蚀变信息的提取方法

Extraction Methods of The Iron Minerallaztion and Alteration Information from ETM+ Remote Sensing Image

蚀变信息的研究一般利用ETM+遥感数据,通过数字图像来处理的。文中利用landsat7 ETM+卫星影像数据,采用主成分分析、比值法,对内蒙古巴彦淖尔地区进行铁化蚀变信息的提取。研究表明,由于受大面积第四系被氧化铁污染的影响,主成分分析提取铁的氧化物类蚀变异常的效果并不理想;而比值法抑制了大面积分布的第四系受氧化铁污染的影响,分析铁化蚀变异常显示效果较为理想,并结合一些遥感图像地质解译,更有利于应用遥感矿化蚀变异常划分找矿远景区,为进一步综合找矿预测提供了依据。

The study of alteration information generally use ETM ＋ remote sensing data, through the digital image to the deal. In this paper, using landsat7 ETM ＋ satellite image data, principal component analyses and ratio technique are main ways for extracting alteration information in bayanehuoer area, lnner Mongolia. Study shows that due to a large area of Quaternary by iron oxide pollution,the results of principal component analysis for extracting of iron oxide alteration of abnormal were not very satisfactory; while the ratio technique inhibited the large area affected by the distribution of Quaternary oxide pollution,the analysis of altered iron abnormalities showed a better effect.Combined with some geological interpretation of remote sensing images, using the abnormal mineralization and alteration for remote sensing divides into prospecting potential area for further comprehensive exploration, provided the basis for prediction.