Extracting mineralogical and geomorphological information using new ASTER mineral maps with airborne geophysics

R Hewson; D Robson; A Mauger; T Cudahy; M Thomas; Simon Jones

doi:10.1071/ASEG2013ab059

ISSN: 2202-0586
E-ISSN:

oa Extracting mineralogical and geomorphological information using new ASTER mineral maps with airborne geophysics
Authors R Hewson^a, D Robson^b, A Mauger^c, T Cudahy^d, M Thomas^e and Simon Jones^f
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^a School of Mathematical & Geospatial SciencesRMIT University, VIC, 3001, , Australia, [email protected] ^b Geological Survey of NSW, PO Box 344, Hunter Region Mail Centre, , NSW, 2310, , Australia, [email protected] ^c DMITRE 101 Grenfell Street Adeliade, , SA, 5000, Australia, [email protected] ^d CSIRO Earth Science & Geospatial Sciences, PO Box 1130, Bentley, , WA, 6102, , Australia, [email protected] ^e Geoscience Australia, , GPO Box 378, Canberra, , ACT, 2601, , Australia, [email protected] ^f School of Mathematical & Geospatial Sciences RMIT University, , VIC, 3001, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab059
- Published online: 01 Dec 2013

Abstract

Australia wide maps have recently been generated and released by CSIRO and Geoscience Australia using the 14 band satellite-borne ASTER sensors. Seventeen map products related to surface composition have been developed, based on spectral absorption features representing either abundance of mineral groups, specific minerals and their chemistry, vegetation cover or regolith related characteristics. This study aims to test the geoscience mapping capabilities of these products, individually, and integrated with airborne geophysics and DEMs over the semi-arid Mt Fitton area, South Australia, and within the agricultural Wagga Wagga region, New South Wales. The robustness of these techniques is evaluated by comparing the results from these two areas with different geological exposure and cultivation.

Various image processing, statistical and principal component analytical (PCA) techniques were utilised. ASTER map products including Ferric Oxide Content, Ferrous Iron Index, AlOH Group Content, MgOH Group Content, MgOH Group Composition, Ferrous Iron Content in MgOH, and Silica Index products proved useful discriminating previously mapped host or altered units of Mt Fitton. PCA correlation statistics proved helpful in devising potentially useful RGB composite imagery incorporating ASTER and geophysics. 2 D scatterplots between different products also proved useful for classifying surface composition. However ASTER map products within the Wagga area proved strongly affected by agricultural and floodplain cover. Slope per cent products generated from Wagga DEMs were useful in focussing ASTER products in areas of hilly and piedmont outcrop or eroded exposures.

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References

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Cudahy, T.J., 2012, Australian ASTER Geoscience Product Notes, Version 1, 7th August, 2012 - CSIR0, ePublish No. EP-30-07-12-44.
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Article Type: Research Article

Keyword(s): ASTER; DEMs data integration; mineralogy; radiometrics

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oa Extracting mineralogical and geomorphological information using new ASTER mineral maps with airborne geophysics

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