NT ASTER Mineral Maps
A partnership between:
- CSIRO Minerals Downunder Flagship
- Western Australian Centre of Excellence for Three Dimensional Mineral Mapping (C3DMM)
- Geoscience Australia
- Northern Territory Government's Bringing Forward Discovery initiative
Northern Territory mineral index maps, generated using data from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), have been released.
This follows the release of the Western Australian in 2011and South Australia maps in 2012 and is a critical step to achieving a national ASTER Geoscience map.
ASTER is a remote sensing tool able to map mineralogy on a regional scale with sufficient spatial and spectral detail for mineral exploration. ASTER mineral index maps enable alteration to be identified before field work is undertaken, maximising the value of time spent in the field.
ASTER's 16 spectral bands were designed specifically to measure diagnostic absorption bands related to mineral groups like clays and iron oxides. From these bands C3DMM has developed a processing methodology to remove complicating effects and transform the raw data into 14 geoscience products from the visible and near infrared (VNIR) and shortwave infrared (SWIR):
The Northern Territory release includes thermal infrared (TIR) mineral products - silica and quartz indices - which add to the 16 standard minerals products generated from ASTER's shorter wavelength bands.
- Regolith ratios
- Opaque index
- MgOH group content
- MgOH group composition
- Kaolin group index
- Green vegetation content
- False colour composite
- Ferrous iron index
- Ferrous iron content
- Ferrous iron content in MgOH
- Ferrous iron composition
- FeOH group content
- AIOH group content
- AIOH group composition
- Silica index
- Quartz index
Accessing the map products
The NT ASTER mineral maps are available in ECW format for viewing through NTGS’s Geophysical Image Web Server. Individual image URL’s are also available for pasting into your GIS application. A complete data set including ECW, TIF, JPG and BSQ data is available from NTGS’s InfoCentre. Please supply a new portable hard drive with at least 500GB capacity.
For geophysical and remote sensing data for the the mines and energy section on the Northern Territory Government website