Study On The Extraction Of Structural And Lithologic Information In West Tianshan Of Xinjiang Based On Remote Sensing Image

Remote sensing geology is use the modern remote sensing techniques to study the geology law,It is a method for regional geological mapping and mineral exploration.It is based on different reactions for different surface features in the aspect of electromagnetic radiation,This is the main use of remote sensing methods to study information extraction of structure,lithology, alteration.In addition, in order to achieve the analysis, judgment,identify certain regional geological laws.It is the main reference to interpret the lineaments and ring structure at the early stage of the geological prospecting.It is the necessary content to interpret the lithology information at the later of mineral exploration.In this paper,The main research areas is Chagangnuoer-Zhibo-Dunde-Beizhan in the west of Tianshan of Xinjiang.It based on Landsat-7,Landsat-8,Google Earth data and others.It also used the GPS point data and measured rock spectral data which collected on the Tianshan mountain.At he same time we combined the theory with remote sensing geological,integrating with geophysical and geochemical information,concentrate on the extraction of structural information and lithology information.At last we made some relevant information analysis and predicted prospecting areas.The main contents are summarized as follows:(1) pretreatment of the images:for getting the image which more suitable for extraction of structure and lithology information,we made some preprocessing such as geometric correction,image mosaic and cropping,atmospheric correction,image enhancement and so on.(2)The interpretation of construction information:Be based on other relevant information such as structural geology theory,field reconnaissance,background of geography,We have interpreted a number of medium-sized and a number of typical lineaments the ring structure in the pre-processed ETM+ image by ArcScene software.(3)The correspondence analysis between Rock spectral and image gray value information. We made some processing and analysis for several typical rock spectral by imaging spectrometer channel resampling methods at the study area. We made the average and normalization for image gray value in pre-processed OLI image of different bands at the study area.We studied the relationship between the rock spectral and image gray value by a method for extracting feature information(corresponding analysis method).Finally,We make out the best fit regression between normalized image gray value curve and resampled spectral curve and by using SPSS software.(4)The lithology information classification and extraction by object-oriented method.Based on the rock spectral and corresponding image gray value analysis,We made the regional lithological and compared it with the geological maps for verification analysis by combined with correlate information such as the rock texture,structure, color, structure, composition and so on.(5)The integrated anomaly analysis.We made the comprehensive abnormal analysis and predict mineralization by combined the information such as structure,lithology, Google earth images and so on.