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Proceedings Paper

Isograde mapping and mineral identification on the island of Naxos, Greece, using DAIS 7915 hyperspectral data
Author(s): Helmut Echtler; Karl Segl; Corinna Dickerhof; Sabine Chabrillat; Hermann J. Kaufmann
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Paper Abstract

The ESF-LSF 1997 flight campaign conducted by the German Aerospace Center (DLR) recorded several transects across the island of Naxos using the airborne hyperspectral scanner DAIS. The geological targets cover all major litho-tectonic units of a metamorphic dome with the transition of metamorphic zonations from the outer meta-sedimentary greenschist envelope to the gneissic amphibolite facies and migmatitic core. Mineral identification of alternating marble-dolomite sequences and interlayered schists bearing muscovite and biotite has been accomplished using the airborne hyperspectral DAIS 7915 sensor. Data have been noise filtered based on maximum noise fraction (MNF) and fast Fourier transform (FFT) and converted from radiance to reflectance. For mineral identification, constrained linear spectral unmixing and spectral angle mapper (SAM) algorithms were tested. Due to their unsatisfying results a new approach was developed which consists of a linear mixture modeling and spectral feature fitting. This approach provides more detailed and accurate information. Results are discussed in comparison with detailed geological mapping and additional information. Calcites are clearly separated from dolomites as well as the mica-schist sequences by a good resolution of the mineral muscovite. Thereon an outstanding result represents the very good resolution of the chlorite/mica (muscovite, biotite)-transition defining a metamorphic isograde.

Paper Details

Date Published: 14 March 2003
PDF: 8 pages
Proc. SPIE 4886, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology II, (14 March 2003); doi: 10.1117/12.462363
Show Author Affiliations
Helmut Echtler, GeoForschungsZentrum Potsdam (Germany)
Karl Segl, GeoForschungsZentrum Potsdam (Germany)
Corinna Dickerhof, Univ. Zuerich-Irchel (Switzerland)
Sabine Chabrillat, GeoForschungsZentrum Potsdam (Germany)
Hermann J. Kaufmann, GeoForschungsZentrum Potsdam (Germany)

Published in SPIE Proceedings Vol. 4886:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology II
Manfred Ehlers, Editor(s)

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