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Researchers at the USGS Spectroscopy Laboratory have measured the spectral reflectance of thousands of materials in the lab and compiled them in the USGS Spectral Library.
SPECPR files provided in the library contain spectra along with linked sample descriptions.
Free software is available for reading spectral library files in SPECPR format:
Both software packages run in UNIX, LINUX, Microsoft Windows, and Apple Macintosh operating systems.
These programs allow users to:
NOTE: USGS Spectral Library Version 7 supersedes older versions of the library, although versions 4, 5, and 6 may still be accessed here.
Clark, R.N., Swayze, G.A., Wise, R.A., Live, K.E., Hoefen, T.M., Kokaly, R.F., and Sutley, S.J., 2007, USGS Digital Spectral Library splib06a: U.S. Geological Survey Data Series 231. View Spectral Library 06.
The UV to mid-infrared 0.2-150 micron library (splib06) contains over 1300 spectra including mid-infrared data as well as spectra from Spectral Library Version 05 and additional visible and near-infrared spectra. The library includes many more minerals, organic and volatile compounds, vegetation, and man-made materials than our previous libraries. The database is over 6,000 web pages, figures, sample images and data listings.
Clark, R.N., Swayze, G.A., Wise, R.A., Livo, E., Hoefen, T.M., Kokaly, R.F., and Sutley, S.J., 2003, USGS Digital Spectral Library splib05a: U.S. Geological Survey Open-File Report 2003-395, 5 figs, 3 tables. View Spectral Library 05.
The library contains spectral covering wavelengths from the ultraviolet to near-infrared along with sample documentation and spectra from Spectral Library Version 4. The library includes samples of minerals, rocks, soils, physical constructed as well as mathematically computed mixtures, vegetation, microorganisms, and man-made materials.
Clark, R.N., Swayze, G.A., Gallagher, A.J., King, T.V.V., and Calvin, W.M., 1993, The U.S. Geological Survey, Digital Spectral Library: Version 1 (0.2 to 0.3 μm): U.S. Geological Survey Open-File Report 93-592, 1326 p. View Spectral Library 04.
Spectral Library 4 (splib04a) includes original laboratory as well as instrument spectral libraries for terrestrial and planetary spectrometers.
For your information, libraries 01, 02, and 03 were experimental exercises on what to include in a spectral library.
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