Research On Alteration Information Extraction Of Yunnan Huize Lead-Zinc Mine Area Based On Terrain

Remote sensing technology is widely used in the field of geology,the most important application is structural analysis and alteration information extraction,in these two aspects of the technology is relatively mature.Wall rock alteration can play a certain role in indicating the location of ore bodies,so the extraction of alteration information can provide some basic data for metallogenic prognosis.The traditional alteration information extraction method takes the whole study area as a large area,and then uses a single threshold to determine the degree of anomaly of the alteration,but there are some problems in this traditional method.For example,disturbance factors such as terrain fluctuation can lead to some weak information lost or filtered out,which limits the accuracy of partial alteration information.Based on the above background,this paper based on the Yunnan province high technology industrial development project "mineral resources prediction and evaluation technology in the remote northeast of Yunnan mining area application",by adding topographic factors related to the spectral information partition to extract alteration information.First,using the DEM data of topography(slope)division,which is divided into the sunny and semi sunny slope and semi shady slope,slope type 4.The spectral information of the corresponding region is divided into different spectral regions,and then the principal component analysis is used to extract alteration information.The main research contents and achievements are as follows:(1)this study used GDEM 30M resolution digital elevation data,the effective extraction of the study area slope map,for spectral remote sensing image partition according to the solar incident angle for the further study on this foundation.(2)in the study area through the spectrum partition iron alteration and carbonatization alteration information extraction,the results showed that in I,II,III and IV 4 spectral partition alteration information distribution,relative to the whole image directly extracting alteration information,method of spectral partitioning,weaken the influence of topography on alteration the information of the spectrum,the alteration information extraction results more reasonable and effective.(3)by comparing the single block and partition method,discovery method based on spectral partition are altered when extracting information and interference information can effectively suppress the sunny slope,shady slope enhance useful information.