introduction the wa aster map is a collaborative project between csiros western australian centre of...

Introduction The WA ASTER Map is a collaborative project between CSIRO’s Western Australian Centre of Excellence for 3D Mineral Mapping (http://c3dmm.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 •AlOH group (clay) content & composition •Kaolin and “Advanced argillic alteration” •Ferric oxide content •Ferrous iron content •Opaques •Fe-OH group content •MgOH/carbonate group & composition •Ferrous iron content in MgOH •Ferric iron content in MgOH ASTER Map of Western Australia 7720000 7700000 7700000 450000 470000 contact: Tom Cudahy phone: (08) 6436 8630 email: [email protected] web: http://c3dmm.csiro.au A collaborative project between: C3DMM - Western Australian Centre of Excellence for 3D Mineral Mapping GSWA – Geological Survey of Western Australia 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 HyMap and satellite ASTER surveys 2006-2008.- CSIRO report P2007/364, 161pp. 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 M4, M9 & F6 Final Rep., 89-94. 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 MgOH- bearing silicates. However, the processing methodology must correct for instrument and atmospheric effects before mineral information can be extracted. C3DMM 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 the national Australian Geoscience Map is planned during the 34 th International Geological Congress in Brisbane, August 2012. Instrument VNIR SWIR TIR Bands 3 6 5 Spatial resolut ion 15m 30m 90m Swath Width 60km 60km 60km Dectector Si-CCD (5000x4) PtSi-CCD (2048x6) HgCdTe (10x5) Scan Pushbroo m Pushbroom Whiskbroo m Crosstrack pointin g ±24.0° ±8.55° ±8.55° Table 1: Specifications of the Advanced Spaceborne Thermal Emission and Reflective Radiometer (ASTER) high low Ferrous iron abundance index high low Kaolin content & Advanced argillic alteration False Colour

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Introduction

The WA ASTER Map is a collaborative project between CSIRO’s Western Australian Centre of Excellence for 3D Mineral Mapping (http://c3dmm.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•AlOH group (clay) content & composition•Kaolin and “Advanced argillic alteration”•Ferric oxide content•Ferrous iron content•Opaques•Fe-OH group content•MgOH/carbonate group & composition•Ferrous iron content in MgOH•Ferric iron content in MgOH

ASTER Map of Western Australia

7720000

77000007700000

450000 470000

contact: Tom Cudahyphone: (08) 6436 8630email: [email protected]: http://c3dmm.csiro.au

A collaborative project between: C3DMM - Western Australian Centre of Excellence for 3D Mineral Mapping GSWA – Geological Survey of Western Australia

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 HyMap and satellite ASTER surveys 2006-2008.- CSIRO report P2007/364, 161pp. 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 M4, M9 & F6 Final Rep., 89-94.

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 MgOH-bearing silicates. However, the processing methodology must correct for instrument and atmospheric effects before mineral information can be extracted. C3DMM 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 the national Australian Geoscience Map is planned during the 34 th International Geological Congress in Brisbane, August 2012.

Instrument VNIR SWIR TIR

Bands 3 6 5

Spatial resolution 15m 30m 90m

Swath Width 60km 60km 60km

DectectorSi-CCD(5000x4)

PtSi-CCD(2048x6)

HgCdTe (10x5)

Scan Pushbroom Pushbroom Whiskbroom

Crosstrack pointing ±24.0° ±8.55° ±8.55°

Table 1: Specifications of the Advanced Spaceborne Thermal Emission and Reflective Radiometer (ASTER)

highlow

Ferrous iron abundance index