EnMAP星载高光谱数据蚀变矿物填图OA

The EnMAP spaceborne hyperspectral sensor has notable advantages in signal-to-noise ratio and spectral response stability.To evaluate the applicability and reliability of EnMAP hyperspectral data for regional-scale mineral mapping,this study investigated alteration mineral identification and spatial distribution in the western Xuemistan area,Xinjiang,using EnMAP Level-2A surface reflectance data acquired in 2025.Considering the low spatial resolution of spaceborne hyperspectral data and the associated mixed-pixel effects,a workflow integrating Minimum Noise Fraction(MNF)transformation,Pixel Purity Index(PPI)endmember extraction,and n-dimensional visualization analysis was applied to extract representative alteration mineral endmembers,including muscovite,chlorite,dolomite,and calcite.Mineral identification was then performed using the Spectral Angle Mapper(SAM)and Mixture-Tuned Matched Filtering(MTMF)methods.The results show that EnMAP data effectively identify the major alteration minerals in the study area.The derived mineral types and spatial distribution patterns are consistent with those obtained from airborne CASI/SASI hyperspectral data,indicating that EnMAP hyperspectral data have strong potential for regional-scale mineral mapping and mineral prospectivity analysis.