Spectral Unmixing Applied to Desert Soils for the - Naval ...

A spectral library was then built and the spectra for the various levels of disturbance were
used as inputs for the mixture analysis and mapping of the AVIRIS imagery.
Figure 19. This figure illustrates the original sample radiance data (red) and white
reference spectrum (black) collected with the ASD spectrometer (left)
compared to the spectrum calculated using spectral math (right). The blue
reflectance spectrum (right), represents the red spectrum (left) divided by
the black spectrum (left) (solar spectrum removed).
3. Spectral Mixture Analysis
The mixture-tuned matched filter (MTMF) approach was used in this research.
The MTMF process combines older methods of Matched Filtering (MF), used for target
signal detection and signal processing, with newer methods and algorithms that account
for mixing of reflectance that occurs within a pixel (Figure 20) (Boardman and Kruse,
2011). The previous MF method had a high false alarm rate and exhibited difficulty
distinguishing between similar yet rare targets in the image space because of mixing that
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