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Visible, Near Infrared, Shortwave Infrared and Thermal Infrared Laboratory Spectra of Samples of Compositionally Variable Dune Fields in the Western United States and Alaska - Sample DS5

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2014-02-18

Citation

Hubbard, B.E., Hooper, D.M., Solano, Federico, and Mars, J.C., 2018, Visible, Near Infrared, Shortwave Infrared and Thermal Infrared Laboratory Spectra of Samples of Compositionally Variable Dune Fields in the Western United States and Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/F7MS3QWM.

Summary

This data represents laboratory reflectance and emissivity spectral measurements of dune sand samples collected from a variety of dune types and mineralogical compositions from eight dune field locations in Alaska, Arizona, California, Colorado, Idaho, Nevada and New Mexico (labeled and designated as samples DS-1 through DS-8). Each sample were sieved into various size classes and measured both prior to and after sieving. Visible through Near Infrared through Shortwave Infrared (~0.4 - 2.5 microns) reflectance were measured using an artificial light source attached to an Analytical Spectral Devices (ASD) spectrometer. Hemispherical reflectance measurements spanning Mid-IR wavelengths, including the Thermal Infrared (~2.0 - 15.0 microns), [...]

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Purpose

The data was obtained in order to test linear deconvolution methods for "unmixing" the mineralogical components of dune sands using thermal infrared emissivity spectra and related imagery. The select dune fields were chosen for comparison to compositionally and geomorphologically similar dune types found on Mars (i.e. in order to assess terrestrial dune fields as martian analogs). Visible through shortwave infrared reflectance measurements were used to determine the composition of other minerals found in various size fractions of Aeolian deposits, but not necessarily as detectable using thermal infrared emissivity measurements, such as clay and mica minerals and ferric-iron minerals which can all occur as larger grain coatings.

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