Evaluating the effect of spatial subsetting on subpixel unmixing methodology applied to ASTER over a hydrothermally altered terrain |
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| Institution: | 1. National Key Laboratory of Science and Technology on Remote Sensing Information and Image Analysis, Beijing Research Institute of Uranium Geology, Beijing 100029, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;1. Ore Deposits and Exploration Centre, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;2. Centre for Exploration Targeting (CET), ARC Centre of Excellence for Core to Crust Fluid Systems, The University of Western Australia, Crawley, WA 6009, Australia;3. Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China;4. Department of Geology, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada;1. Department of Earth Sciences, University of Douala, P.O. Box 24157, Douala, Cameroon;2. Geologie, TU Bergakademie Freiberg, 09599 Freiberg, Germany;3. Department of Earth Sciences, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;1. Department of Geology, Federal University of Pernambuco, Av. da Arquitetura, s/n, 50740-550, Recife-Pernambuco, Brazil;2. Institute of Geosciences, University of Campinas, PO Box 6152, 13083-870, Campinas, São Paulo, Brazil;3. Institute of Geosciences, University of Brasília, Campus Universitário Darcy Ribeiro s/n, Asa Norte, 70910-900, Brasília, Distrito Federal, Brazil;1. Mining Engineering Department, Colorado School of Mines, CO, 80401, Golden, USA;2. Center for Image Analysis (OGAM), Middle East Technical University, 06800, Ankara, Turkey;1. Department of Geology, Faculty of Science, South Valley University, 83523, Qena, Egypt;2. Geology Department, Faculty of Science, Suez University, Suez, 43518, Egypt;3. Geological Hazards Department, Applied Geology Sector, Saudi Geological Survey, PO Box 54141, Jeddah, 21514, Saudi Arabia;4. Department of Geology, Faculty of Science, Sohag University, 82511, Sohag, Egypt |
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| Abstract: | This study investigates the effect of spatial subsets of Advanced Spaceborne Thermal Emission and Reflection radiometer (ASTER) L1B visible-near infrared and short wave-infrared (VNIR-SWIR) data on matched filtering results at the central part of Kerman magmatic arc, where abundant porphyry copper deposits exist. The matched filtering (MF) procedure was run separately at sites containing hydrothermal minerals such as sericite, kaolinite, chlorite, and jarosite to map the abundances of these minerals on spatial subsets containing 100, 75, 50, and 25 percent of the original scene. Results were evaluated by comparing the matched filtering scores with the mineral abundances obtained by semi-quantitative XRD analysis of corresponding field samples. It was concluded that MF method should be applied to the whole scene prior to any data subsetting. |
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| Keywords: | Spatial subset MF Semi-quantitative XRD ASTER |
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