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: B5/B4

- Blue is low ferrous iron content in carbonate and MgOH minerals like talc and tremolite.

- Red is high ferrous iron content in carbonate and MgOH minerals like chlorite and actinolite.

Useful for mapping:

(1) un-oxidised “parent rocks” – i.e. mapping exposed parent rock materials (warm colours) in transported cover;

(2) talc/tremolite (Mg-rich – cool colours) versus actinolite (Fe-rich – warm colours);

(3) ferrous-bearing carbonates (warm colours) potentially associated with metasomatic “alteration”;

(4) calcite/dolomite which are ferrous iron-poor (cool colours); and

(5) epidote, which is ferrous iron poor (cool colours) – in combination with FeOH content product (high).

For 'Ferrous Iron Content in MgOH/Carbonate' dataset information, see the dataset record: http://pid.geoscience.gov.au/dataset/ga/74361

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