Research And Application Of Information Extraction Of Skarn Deposits With Hyperspectral Data

The thesis with "The research and demonstration of thermal infrared hyperspectral mineralization and alteration mineral extraction" project,carried out research and application of extraction of skarn deposits with hyperspectral data.Analyzing the all bands data characteristicsof SASI-TASI and the spectral characteristics of related mineral information aboutskarn deposits,The thesis carried out the study about methods of endmember extraction,spectrum matching and abundance estimation.Based on the above research,The thesis selected suitable methods for typicalskarn minerals information extraction,getting the maps of typicalskarn minerals information distribution and abundance estimation based on SASI and TASI data.On the basis of above research,combining with field investigation data,the geological background and the result of typical skarn mineralinformation extraction,the thesis established the skarn deposit mining parameters of remote sensingin study area.The thesis predicted the unknown skarn deposit in studyarea,delineating the target of skarn deposit remote sensingmining.The main research contents and results were as follows:(1)In the aspect of endmember extraction,using Matlab programming platform for building SASI and TASI simulation data,the thesis analyzed the effect of each endmember extraction methods.The thesis choose the high precision endmember extraction methods of PPI to apply in hyperspectral data.(2)In the aspect of spectrum matching,We know that the spectrum Angle matching method(SAM)is better than spectral information divergence(SID)for SASI data and the spectral information divergence(SID)is better than spectrum Angle matching method(SAM)for TASI data by the contrast analysis of three kinds of spectrum matching method.In the aspect of using all bands data of SASI-TASI to extract carbonate minerals information,The SASI data is better than TASI data.(3)In the aspect of abundance estimation,the contrast analysis of four kinds of least-square method,the thesis choosed the most accurate calculation results of FCLS algorithm to apply typical skarn mineral abundance estimation based on TASI data.(4)According the above research results,the thesis used PPI methods in endmember extraction.Using SASI data by the method of SAM to extract mineral information of tremolite,actinolite,calcite and dolomite.Using TASI data by the method of SID to extract mineral information of garnet.Using TASI data by the algorithm of FCLS to extract mineral abundance information of garnet and calcite.Finally,the thesis got the maps of typical skarn mineral information distribution and abundance estimation.Combined with the known the skarn deposits,the minerals information extraction results is accurate.According Strata,magmatic rocks,structures and the result of typical skarn mineralinformation extraction,the thesis established the skarn deposit mining parameters of remote sensingin study area.The thesis predicted the unknown skarn deposit in the study area,delineating the target of skarn deposit.The field investigation result proved the predicted result is right.