Spectral Identification -- Datasets

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We have worked with three sets of data:

• In the initial phase of the work, a limited database of seven mineral spectra was used for study, along with six author-constructed `non-spectra'. The wavelength range of the spectra was 2.0-2.4 microns and they are sampled at 0.01 micron intervals i.e., there are 41 bins per spectrum.

• Laboratory-measured high-resolution ozone spectra were used for gas samples at temperatures of 200, 220, 240, 260, 280, and 300K. The original wavelength range of 320-337 nm was sub-sampled into 35 equally-sized bins for this study: the sampling density is not as high as can be achieved with a high-resolution spectrometer but is sufficient to encode the general shapes of the curves.

• In the second phase of our work, a much larger database of spectra was obtained from J. Price of the Beltsville Agricultural Research Center, USA. This database, which is free to all, contains spectra of soils, both wet and dry, vegetation, at various growing stages, man-made materials, metals and minerals. The wavelength range of the spectra is 0.4-2.5 microns and they are sampled at 0.01 micron intervals i.e., there are 211 bins per spectrum. The various subsets (i.e., soils, vegetation, minerals) of this database were examined and it was decided that the mineral subset of this database should be used. This subset was given to Price by JPL and consists of 160 laboratory-measured (by Beckman spectrometer) reflectance.