NDLI: Detection and mapping of mineralized areas in the cortez-uinta belt, utah-nevada, using computer-enhanced erts imagery (Document No: 19760014562)

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Detection and mapping of mineralized areas in the cortez-uinta belt, utah-nevada, using computer-enhanced erts imagery (Document No: 19760014562)

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1976
Description	The author has identified the following significant results. Mineralogical differences between hydrothermally altered rocks and most unaltered rocks in south central Nevada cause visible and near infrared (0.45-2.4 micron) spectral reflectance differences which can be used to discriminate broad categories of rocks in multispectral images. The most important mineralogical differences are the increased abundance of goethite, hematite, jarosite, alunite, montmorillonite, and kaolinite in the altered zones. Because of the wavelength positions and widths of the LANDSAT MSS bands, these spectral differences are not apparent in individual or color infrared composite MSS images. The technique developed to enhance these subtle spectral differences combines ratioing of the MSS bands and contrast stretching. Field evaluation of color-ratio composite shows that, after exclusion of alluvial areas, approximately 80% of the green and brown color patterns are related to hydrothermal alteration. The remaining 20% consists mainly of pink hematitic crystallized tuff and tan or red ferruginous shale and siltstone.
File Size	5401198
Page Count	61
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19760014562
Archival Resource Key	ark:/13960/t4pk55k30
Language	English
Publisher Date	1976-02-15
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Multispectral Band Scanners Earth Resources Program Multispectral Photography Rocks Mapping Minerals Utah Spectral Reflectance Image Enhancement Nevada Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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