Spectral mixture modeling - A new analysis of rock and soil types at the Viking Lander 1 site

Details Spectral mixture modeling - A new analysis of rock and soil types at the Viking Lander 1 site Spectral mixture modeling - A new analysis of rock and soil types at the Viking Lander 1 site

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8098a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, July 10, 1986, p. 8098-8112.

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188

Astronomical Models, Mars Surface, Rocks, Satellite Imagery, Soils, Spectral Reflectance, Image Analysis, Landing Sites, Petrology, Planetology, Spectrum Analysis, Viking Lander 1

Scientific paper

A Viking Lander 1 image was modeled as mixtures of reflectance spectra of palagonite dust, gray andesitelike rock, and a coarse rocklike soil. The rocks are covered to varying degrees by dust but otherwise appear unweathered. Rocklike soil occurs as lag deposits in deflation zones around stones and on top of a drift and as a layer in a trench dug by the lander. This soil probably is derived from the rocks by wind abrasion and/or spallation. Dust is the major component of the soil and covers most of the surface. The dust is unrelated spectrally to the rock but is equivalent to the global-scale dust observed telescopically. A new method was developed to model a multispectral image as mixtures of end-member spectra and to compare image spectra directly with laboratory reference spectra. The method for the first time uses shade and secondary illumination effects as spectral end-members; thus the effects of topography and illumination on all scales can be isolated or removed. The image was calibrated absolutely from the laboratory spectra, in close agreement with direct calibrations. The method has broad applications to interpreting multispectral images, including satellite images.

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