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Influence of spectrally neutral components on relative band contrasts in intimate mixtures: Implications for remote sensing. 1. Nonlinear mixing modeling

Moroz, L. and Arnold, G. (1999) Influence of spectrally neutral components on relative band contrasts in intimate mixtures: Implications for remote sensing. 1. Nonlinear mixing modeling. Journal of Geopysical Research, 104 (E6), 14,109-14,121.

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Abstract

The application of nonlinear mixing to model the band contrasts in the spectra of intimate mixtures shows that not only the band contrasts but also their ratios are sensitive to the presence of a featureless end-member. The ratio of the contrast of the weaker band to that of the deeper one decreases with increasing content of neutral phase. The degree and the rate of decline depend on a number of factors. When a neutral phase is present, the use of relative band contrasts to estimate the relative abundance of end-member results in systematic erros. In mutlicomponent mixtures the presence of a spectrally neutral phase leads to the underestimation of the component with the weaker band. The larger the difference in contrasts between the bands, the larger is the systematic error. Additional factors increasing the error are an opacity of the neutral phase, a large difference in brightness between the neutral phase and the components with absorption features, a decreased grain size of the neutral component relative to those of the other constituents, and decreased grain size of all end-members. The use of calibrations for binary mineral mixtures to analyze the spectra of mutlicomponent surfaces should be subjects to errors when opaque constituents are present. Some variations in relative band contrast of asteroid spectra due to variable contents and/or particle size of opaques may be misinterpreted as variations in silicate modal abundance.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2000,
Title:Influence of spectrally neutral components on relative band contrasts in intimate mixtures: Implications for remote sensing. 1. Nonlinear mixing modeling
Authors:
AuthorsInstitution or Email of Authors
Moroz, L.UNSPECIFIED
Arnold, G.UNSPECIFIED
Date:1999
Journal or Publication Title:Journal of Geopysical Research
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:104
Page Range:14,109-14,121
Status:Published
Keywords:mixing modeling, reflectance spectra, neutral components, intimate mixtures
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institut für Weltraumsensorik und Planetenerkundung
Deposited By: Susanne Pieth
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 18:39

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