Bright sand/dark dust: The identification of active sand surfaces on the Earth and Mars

Details Bright sand/dark dust: The identification of active sand surfaces on the Earth and Mars Bright sand/dark dust: The identification of active sand surfaces on the Earth and Mars

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..257b&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 257-258 (SEE N87-23341 16-91)

Physics

Geophysics

Earth Surface, Infrared Reflection, Mars Surface, Particle Size Distribution, Reflectance, Remote Sensing, Sands, Satellite Imagery, Spectral Reflectance, Wind Effects, Grain Size, Landsat 4, Mars Observer, Planetary Composition, Thematic Mappers (Landsat)

Scientific paper

Field studies and analysis of LANDSAT Thematic Mapper data in the Gran Desierto, Mexico may shed light on a technique to distinguish active from inactive (relict) sand surfaces. Active sand bodies in the study area are consistently brighter (by an average of 20%) at visual and near infrared wavelengths and darker at thermal infrared wavelengths than compositionally similar inactive sands. The reasons for the albedo difference between active and inactive sands are reviewed and the mixing model of Johnson et al. is examined for tracing the provenance of sands based on albedo and spectral variations. Portions of the wavelengths covered by the Mars Orbiter correspond to the Thematic Mapper data. The identification of active sands on Earth, with a priori knowledge of bulk composition and grain size distribution, may allow the remote mapping of active sand surfaces on Mars. In conjuction with thermal infrared remote sensing for composition, it may also provide a method for the remote determination of grain size distributions within sand/silt mixtures.

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