Abstract
The minerals industry uses multispectral Advanced Spaceborne Thermal Emission Reflectance Radiometer (ASTER) data for geological mapping with enthusiasm around the world. ASTER represents an advance beyond the capabilities of the 7-band Landsat Thematic Mapper, measuring radiant energy from 14 bands, within the visible-near infrared (VNIR), the shortwave infrared (SWIR), and thermal infrared (TIR) wavelength regions, at spatial resolutions ranging from 15 to 90 m (Yamaguchi et al. 1998). Geologists used ASTER data for its multispectral coverage in the mineralogically significant SWIR wavelength region (Yamaguchi et al. 1998), where OH-bearing and carbonate minerals have diagnostic spectral features (Clark et al. 1990; Grove et al.1992). ASTER also provides multispectral coverage within TIR wavelengths (Yamaguchi et al. 1998), where many other silicates (and carbonates) have diagnostic features (Salisbury and D’Aria 1992).
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