Now, based on examination of the DCS image, how many spectrally distinct units are present?
(no right answers again for these questions…) Note how the dune field appears in the DCS image. Which unit would you guess is the source of the dunes? Try a decorrelation stretch using Bands 9, 6, and 4. Now that you can see additional spectral information (by looking at two separate stretches), would you answer the previous question the same way from just looking at the 8-7-5 image? Why do the two DCS images look slightly different? The 8-7-5 and 9-6-4 band combinations were pre-selected for you simply because they provide broad spectral coverage. Choose a third band combination and try the DCS. Describe any new spatial variability in spectral properties that you find. 5. Quantify differences between spectral units. (back to top) Remember that the DCS is a type of stretch, therefore it is possible that differences observed in the stretch may be not that great in actuality. Examining the spectra from each ‘spectral unit’ allows you to quantify the differences observed in the DCS imag
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