18.5 Real Image Experiments
Two sets of real image data were considered for experiments in this section. The first one is a well-known scene shown in Figures 1.9 and 1.10 collected by the airborne visible infrared imaging spectrometer (AVIRIS) over the Cuprite mining site, Nevada, in 1997. It has 224 spectral bands and image size of 
pixels. The second image data were collected by the Digital Airborne Imaging Spectrometer (DAIS 7915) over the city of Pavia, Italy, in 2001, and has size of 
pixels. Both image data sets have available ground truth to substantiate our pixel information analysis.
18.5.1 AVIRIS Image Data
The AVIRIS Cuprite scene is available online at http://aviris.jpl.nasa.gov in both radiance and reflectance units. Here, atmospherically corrected data will be used in order to relate to available ground spectra, and also to discuss the impact of atmospheric corrections. Prior to analysis, bands 105–115 and 150–170 were removed due to water absorption and low SNR in those bands. Figure 1.9(b) shows a single band of the AVIRIS data, where the ground truth provides the precise spatial locations of pure pixels that correspond to the five minerals, alunite, buddingtonite, calcite, kaolinite, and muscovite, labeled by “A”, “B”, “C”, “K,” and “M.” These pixels are carefully ...
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