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<strong>ASTER</strong> Users HandbookFigure 18: Spectral Angle Mapper Classification of Cuprite SWIR data.(Note: blue = kaolinite; red = alunite; light green = calcite; dark green = alunite+kaolinite;cyan = montmorillonite; purple = unaltered; yellow = silica or dickite)When this map was compared with more detailed mineral classification produced from AVIRISdata, the correspondence is excellent. The resampled library spectra are shown in Figure 19compared with <strong>ASTER</strong> image spectra extracted from 3x3 pixel areas.43
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