Use of CASI/SASI imaging spectrometer data to map mineralogy in the Hongliugou area on the northern margin of the Altyn Tagh mountains

摘要

CASI/SASI data covering the hongliugou hydrothermal metallic deposit, western altyn tagh mining districts, were used to map hydrothermal alteration minerals. The hyperspectral data were calibrated to apparent surface reflectance using the empirical line method and the method of radiative transfer model. The three methods of estimating apparent surface reflectance have been evaluated by using field spectral. Two spectral unmixing algorithms (MTMF and CEM) were applied to analyse imaging spectrometer data. The objective was to compare the performance of the two algorithms, in order to map surface hydrothermal alteration mineralogy in the hongliugou area. Altered rocks and faults in the district can be discriminated by use of mineral distribute images derived from CASI/SASI data.