Hyperspectral Remote Sensing
The spectral features of the VNIR range (0.4 – 1.0 µm) occur due to electron transition processes while the features of the SWIR (1 – 2.4 µm) are as a result of overtones and combination tones of the fundamental vibrations of the molecules. The features of the TIR (7 – 12 µm) are based on fundamental vibrations. The potential to detect a material depends on its IR active wavelength range. For example carbonates, sulphates, hydrous silicates, or phosphates show the mineral diagnostic spectral features in the VNIR-SWIR wavelengths range and are therefore VNIR-SWIR active (fig. 1). Anhydrous silicates such as quartz, feldspars, garnets or pyroxenes solely show their spectral features in the TIR (fig. 2).
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Contact 2: