NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Landsat-4 thematic mapper and thematic mapper simulator data for a porphyry copper depositAircraft thematic mapper (TM) data were analyzed to evaluate the potential utility of the Landsat-4 thematic mapper for geologic mapping and detection of hydrothermal alteration zones in the Silver Bell porphyry copper deposit in southern Arizona. The data allow a comparison between aircraft TV simulator data and the Landsat-4 TM satellite data which possess similar spectral bands. A color rationcomposite of 30-m pixels was resampled, in order to clearly define a number of hydroxyl bearing minerals, (kaolinite, sericite, white mica), pyrite and iron oxide/hydroxide minerals. The iron oxide minerals have diagnostic absorption bands in the 0.45 and 0.85 micron regions of the spectrum, and the hydrous minerals are characterized by an absorption in the 2.2 micron region. The position of the spectral bands allow the TM to identify regions of hydrothermal alteration without resorting to a data processing algorithm. The comparison of the aircraft and Landsat-4 TM data showed considerable agreement, and confirmed the utility of TM data for identifying hydrothermal alteration zones. Samples of some color TM images are provided.
Document ID
19840062137
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Abrams, M. J.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1984
Publication Information
Publication: Photogrammetric Engineering and Remote Sensing
Volume: 50
ISSN: 0099-1112
Subject Category
Earth Resources And Remote Sensing
Accession Number
84A44924
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available