Visible, Near Infrared, Shortwave Infrared and Thermal Infrared Laboratory Spectra of Samples of Compositionally Variable Dune Fields in the Western United States and Alaska
Dates
Publication Date
2018-01-19
Time Period
2012-06-10
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
These 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 was 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), [...]
Summary
These 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 was 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), were measured using a Nicolet FTIR spectrometer with a gold integrating sphere attachment. These latter measurements were converted from wavenumber to wavelength, and inverted to measure emissivity. TIR spectral measurements were conducted for most of our eight dune samples prior to sieving and do not include measurements of various size fractions, except for one sample (DS-8). VSWIR reflectance measurements are included for each of the full composite samples prior to sieving, as well as selected size fractions after sieving such as the smallest (e.g., pan fraction) and largest measurable size fractions.
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Related External Resources
Type: Related Primary Publication
Hubbard, B.E., Hooper, D.M., Solano, Federico, and Mars, J.C., 2018, Determining mineralogical variations of aeolian deposits using thermal infrared emissivity and linear deconvolution methods: Aeolian Research, v. 30, p. 54-96, https://doi.org/10.1016/j.aeolia.2017.12.001.
The data were 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 selected 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.
