Analysis Of Minerals’ Spectral Features And Extraction Of Prospecting Information Using Multi-source Remote Sensing Data Of PuXiong In GeJiu, Yunnan Province

The puxiong area has multiple phases of magmatism,Studies have shown that faults control on migration and enrichment of ore-forming fluids to a certain extent.Author synthesize utilizes the space and spectral characteristics of multi-source remote sensing data, and coupled with 3D remote sensing images of the study area to carry out the lineament interpretation.From a qualitative and quantitative perspective to analysis the lineament,summarized its spatial distribution feature,the correlation with existing mines and the prospecting significance. As we all know,the spectral information of ores couble be a directly prospecting indicators,but the main composition of ores have non-stable absorption characteristics.this paper uses the spectra characteristics of wild rock samples as a reference, synthesize analysis the spectrum come from laboratory and RS image.According to the features of multi-source remote sensing data to establish the direct or indirect identification marks in puxiong.Finally,using appropriate technical means to extract mineral information respectively,and compared the recognition effects and analyze its prospecting significance.In the case, we major study of the following:(1) collected ALI and ASTER multispectral data, Hyperion hyperspectral imagery and digital elevation models that covering the study area, complete the preprocessing of remote sensing data for research required,including geometric correction, sub-area selection, radiometric and atmospheric correction.the repreprocessing of Hyperion is more complex,Also it includes some targeted treatment;(2) In order to take full advantage of the space and spectral information of multi-source remote sensing data,merged ASTER VNIR Multispectral bands with ALI panchromatic data and made 3D image with digital elevation models of the study area, analysis the features of the already existing faults in RS image to sum up the interpretation signs,then with the former interpretation signs to interpret the linear structure;(3) Overlaying the results of linear structure interpretation and mines in the study area, qualitative analysis of the spatial correlation. Statistics its orientation and strength characteristics, lineament density characteristics and the fractal characteristics from a quantitative point of view,Reduce the subjective and arbitrary of visual judgment.Study on structural features that related to delineation of ore favorable position;(4) Synthesize analysis the spectrum come from wild rock samples,laboratory and RS image to establish the mineral identification marks.the spectra of the pixels were extracted from ALI+ASTER and Hyperion,and then compared with the spectra of minerals from the USGS spectra library resampled to the RS bandpasses.establish the contact between the ground information with the image information;(5) Based on previous research,Author extracted alteration information of ALI+ASTER imagery based on singular value decomposition,and presented a new approach to extract the alteration information from Hyperspectral Imagery based on SCA and SID,then compared the recognition effects and analyze its prospecting significance. The above study got the following conclusions and results:(1) the study area common development small faults,local development with the controllability of big break.the advantage orientation of mineralization is north-east.the regional lineament showed excellent statistical self-similarity and fractal characteristics.the high values of linear structure fractal dimension and density information were consistency with the existing deposit point in the spatial distribution.the results showed that the linear structure in puxiong had a strong influence on the mineralization;(2) Synthesize analysis the spectrum come from wild rock samples,laboratory and RS image to establish the mineral identification marks.the spectra of the pixels were extracted from ALI+ASTER and Hyperion,and then compared with the spectra of minerals from the USGS spectra library resampled to the RS bandpasses,showed that the mineral information could be the indirect extraction flag of ores in gejiu puxiong;(3) On the whole,the mineral alteration information extracted from ALI+ASTER multispectral data and Hyperion hyperspectral data were mostly consistent with field-test results, Hyperion data were only marginally better for mineral mapping than the merged 13-channal,low spectral resolution,high signal-to noise ALI+ASTER dataset,and the prospecting information extracted from this paper were highly consistency with the existing deposit point in the spatial distribution.