ASTER Map of Western Australia A collaborative project between: C 3 DMM - Western Australian Centre of Excellence for 3 D Mineral Mapping GSWA – Geological Survey of Western Australia Introduction The WA ASTER Map is a collaborative project between CSIRO’s Western Australian Centre of Excellence for 3 D Mineral Mapping (http: //c 3 dmm. csiro. au/) and GSWA. This project is part of a bigger initiative with the Australian geological surveys (federal and state) working towards an ASTER geoscience map of the Australian continent. Amongst the national set of standard, publicly available, web accessible geoscience products derived from ASTER (Advanced Spaceborne Thermal Emission and Reflective Radiometer, http: //asterweb. jpl. nasa. gov/) are the following maps: • False colour • Green vegetation content • CSIRO “regolith” ratios • Al. OH group (clay) content & composition • Kaolin and “Advanced argillic alteration” • Ferric oxide content • Ferrous iron content • Opaques • Fe-OH group content • Mg. OH/carbonate group & composition • Ferrous iron content in Mg. OH • Ferric iron content in Mg. OH Kaolin content & Advanced argillic alteration low high Ferrous iron abundance index low high 7720000 False Colour Instrument VNIR SWIR TIR Bands 3 6 5 Spatial resolution 15 m 30 m 90 m Swath Width 60 km Si-CCD Pt. Si-CCD Hg. Cd. Te (5000 x 4) (2048 x 6) (10 x 5) Dectector Scan Pushbroom Whiskbroom Crosstrack pointing ± 24. 0° ± 8. 55° Table 1: Specifications of the Advanced Spaceborne Thermal Emission and Reflective Radiometer (ASTER) 7700000 Processing and Delivery Compared to Landsat, ASTER has five additional bands in the SWIR (Table 1), which can be used to identify additional mineral groups, such as clay minerals, carbonates and hydrated Mg. OH-bearing silicates. However, the processing methodology must correct for instrument and atmospheric effects before mineral information can be extracted. C 3 DMM is developing workflows and software applications, that include these processing steps to deliver seamless, cross-calibrated, high-quality geoscience products. The displayed images (‘false colour composite’, ‘ferrous iron abundance index’, ‘kaolin content & advanced argillic alteration’) show preliminary geoscience products. The delivery of the final WA ASTER Map is scheduled for June 2011, whereas the release of 470000 450000 the national Australian Geoscience Map is planned during the 34 th International Geological Congress in Brisbane, August 2012. ASTER related literature: Cudahy, T. , Jones, M. , Thomas, M. , Laukamp, C. , Caccetta, M. , Hewson, R. , Rodger, A. , Verrall, M. (2008): Next Generation Mineral Mapping: Queensland airborne Hy. Map and satellite ASTER surveys 2006 -2008. - CSIRO report P 2007/364, 161 pp. Hewson, R. D. , Cudahy, T. J. , Mizuhiko, S. , Ueda, K. , Mauger, K. (2005): Seamless geological map generation using ASTER in the Broken Hill-Curnamona province of Australia. - Remote Sensing of Environment, 99, 159 -172. Hewson, R. D. , and Cudahy, T. J. (2010). ‘Geological mapping accuracy issues using ASTER in Australia. ’ Applications in ASTER, Land Remote Sensing and Global Environmental Change: NASA’s Earth Observing System and the Science of ASTER and MODIS. Eds. Ramachandran, B, Justice, C, and Abrams M. , Springer, New York. . Jones, M. , Cudahy, T. , Thomas, M. , Laukamp, C. (2008): Hyperspectral and ASTER mineral maps of Queensland. - Preview, Australian Soc. of Exploration Geologists, 136, 28 -29. Laukamp, C. (2008): Validation of Spectral Techniques for Exploration in the Mt Isa Terrane. - In: Sheldon, H. A. : Enabling Technologies - pmd*CRC Project M 4, M 9 & F 6 Final Rep. , 89 -94. contact: phone: email: web: Tom Cudahy (08) 6436 8630 thomas. cudahy@csiro. au http: //c 3 dmm. csiro. au
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