Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/69030
Type: Artigo de periódico
Title: Hydrothermal alteration mapping at Bodie, California, using AVIRIS hyperspectral data
Author: Crosta, AP
Sabine, C
Taranik, JV
Abstract: AVIRIS data covering the Bodie and neighboring Paramount mining districts, eastern California, were used to map hydrothermal alteration minerals. Two spectral analysis algorithms were used: Spectral Angle Mapper (SAM) and Tricorder. The objective was to compare the performance of the two algorithms where no a priori ground or atmospheric information is available. AVIRIS data were calibrated to apparent surface reflectance using a modified MODTRAN radiative transfer model in conjunction with laboratory and in-flight calibration data. Both algorithms appear to produce satisfactory results for geologic reconnaissance and mapping applications, but Tricorder generally classified more pixels and identified more mineral species than SAM. For some minerals, such as Na-montmorillonite, results from Tricorder and SAM matched reasonably well, but major differences appeared in how to two algorithms classified kaolinite group minerals and ferric oxides. Laboratory spectra of rock samples from five localities were compared to reference spectra of minerals identified by the classification algorithms for corresponding pixels, with the results matching to some extent. (C)Elsevier Science Inc., 1998
Country: EUA
Editor: Elsevier Science Inc
Rights: fechado
Identifier DOI: 10.1016/S0034-4257(98)00040-6
Date Issue: 1998
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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