NDLI: Mapping of hydrothermal alternation zones and regional rock types using computer enhanced erts mss images. [nevada

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Mapping of hydrothermal alternation zones and regional rock types using computer enhanced erts mss images. [nevada

Content Provider	NASA Technical Reports Server (NTRS)
Author	Billingsley, F. C. Goetz, A. F. H. Wetlaufer, P. H. Rowan, L. C.
Copyright Year	1974
Description	A combination of digital computer processing and color compositing of ERTS MSS images has been used to map hydrothermal alternation zones and regional rock types in south-central Nevada. The technique is based on enhancement of subtle visible and near infrared reflectivity differences between mineralogically dissimilar rocks, especially unaltered and altered rocks. MSS spectral bands are ratioed, pixel by pixel, in the computer and subsequently stretched. These ratio values are used to produce a new black and white image which shows the subtle spectral reflectivity differences. Additional enhancement is achieved by preparing color composites of two or more stretched ratio images. The choice of MSS bands for rationing depends on the spectral reflectance properties of the rocks to be discriminated. Although this technique is in the initial stage of development and is untested in other areas, it already appears to have considerable potential for targeting mineral prospects and for regional geologic mapping.
File Size	86411
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19740022648
Archival Resource Key	ark:/13960/t6f23qv1p
Language	English
Publisher Date	1974-01-01
Access Restriction	Open
Subject Keyword	Geophysics Computer Programming Hydrology Multispectral Band Scanners Earth Resources Program Photogeology Photomapping Rocks Water Resources 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	Article

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