Analysis And Application Of Abnormal Information Extraction Of Mineralization Alteration Based On Multi-source Remote Sensing

Xinjiang Tashkurgan County is located in the Tarim land masses and the West Kunlun-Karakorum orogenic belt junction,geological structure is complex,and metallogenic geological conditions are favorable,with good geological prospecting prospects,but the natural conditions of this region are very poor,and the traffic is extremely inconvenient,So the geological research and mineral exploration work is relatively low.Remote sensing technology as a high-tech method,based on field investigation and analysis of the mineral spectral characteristics,through remote sensing geological interpretation and mineralization alteration information extraction,the establishment of remote sensing prospecting model and carried out based on remote sensing technology integrated metallogenic prediction,For the follow-up mineral resources exploration work specified direction.Based on the spectral characteristics of the mineral and the band setting characteristics of the ASTER data,the main component analysis of the 1,4,(6 + 7)/ 2,8 band combination was used to extract the potassium species Information,1,2,3,4 band combination extraction iron dyed alteration information,1,4,5,6 extraction kaolin alteration information,1,3,4,(5 + 8)/ 2 extraction of carbonate Alteration and 1,3,4,8 extraction of alpine rock alteration information;band ratio B14 / B10 extraction silicification alteration information,(7 + 5)/ 6 for sericite extraction.Using the Landsat8 data,The alteration information of iron was extracted by principal component analysis of 2,4,5,6 band combination;The extraction of hydroxyl and carbonate alteration information was carried out using the principal component analysis of the 2,5,6,7 band combination.According to the results of mineralization and alteration information extraction of two kinds of data sources,the design and development of multi-spectral mineralization alteration information extraction software is realized.This software has the functions of image display,image statistical information calculation,image stretching,image filtering and other basic image processing functions;it also has band operations,principal component analysis and other advanced functions.The research and development of the software not only realized the extraction of mineralized alteration information for multi-spectral data,but also provided valuable experience for the future development of commercial remote sensing image processing software.