The National ASTER Map of Australia is the parent datafile of a dataset that comprises a set of 14+ geoscience products made up of mosaiced ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) scenes across Australia.

ASTER calibration, processing and standardisation approaches have been produced as part of a large multi-agency project to facilitate uptake of these techniques and make them easily integrated with other datasets in a GIS.

Collaborative research, undertaken by Geoscience Australia, the Commonwealth Scientific Research Organisation (CSIRO) and state and industry partners, on the world-class Mt Isa mineral province in Queensland was completed in 2008 as a test-case for these new methods.

For parent datafile information, see the dataset record: http://pid.geoscience.gov.au/dataset/ga/74347

Band ratio: (B6+B9)/(B7+B8)

- Blue is low content,

- Red is high content

(potentially includes: calcite, dolomite, magnesite, chlorite, epidote, amphibole, talc, serpentine)

Useful for mapping:

(1) “hydrated” ferromagnesian rocks rich in OH-bearing tri-octahedral silicates like actinolite, serpentine, chlorite and talc;

(2) carbonate-rich rocks, including shelf (palaeo-reef) and valley carbonates(calcretes, dolocretes and magnecretes); and

(3) lithology-overprinting hydrothermal alteration, e.g. “propyllitic alteration” comprising chlorite, amphibole and carbonate.

The nature (composition) of the silicate or carbonate mineral can be further assessed using the MgOH composition product.

For 'MgOH Group Content' dataset information, see the dataset record: http://pid.geoscience.gov.au/dataset/ga/74359

For service status information, see https://status.dea.ga.gov.au