Radiometric thorium equivalent grid of Urapunga, NT, 1994 survey
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Geophysical Acquisition & Processing Section
The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
This radiometric thorium grid has a cell size of 0.001 degrees (approximately 110m) and shows thorium element concentration of the Urapunga, NT, 1994 survey. The data used to produce this grid was acquired in 1994 by the NT Government, and consisted of 68000 line-kilometres of data at 500m line spacing and 100m terrain clearance.
Australian Government Security ClassificationSystem
Classification - unclassified
Creative Commons Attribution 4.0 International Licence
Access - license
Use - license
This rNT0622tS.nc grid is an airborne-derived radiometric thorium equivalent grid for the Urapunga, NT, 1994 survey. The survey was acquired under the project No. 622 for the geological survey of NT. The grid has a cell size of 0.001 degrees (approximately 110m). A total of 68000 line-kilometres of data at a line spacing of 500m were acquired to produce this grid. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid (Milligan et al., 2009). This survey grid is essentially levelled to AWAGS. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134. Further up to date information about individual surveys can also be obtained online from the Airborne Surveys Database at http://www.ga.gov.au/oracle/argus/.
The original grid was converted from ERMapper (.ers) format to netCDF4_classic format using GDAL1.11.1. The main purpose of this conversion is to enable access to the data by relevant open source tools and software. The netCDF grid was created on 2016-08-29T10:51:42 and has its y-axis indexed Southward-positive.
Milligan, P.R., Minty, B.R.S., Richardson, M. & Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey accurate continental magnetic coverage. Preview, No. 138, p. 1-128.
Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
WGS 84 (geocentric) (EPSG:4328)
Downloads and Links
Digital Object Identifier for dataset b381a396-7d03-4a84-839d-1aa90076e44c
NetCDF file on NCI filesystem for dataset b381a396-7d03-4a84-839d-1aa90076e44c
THREDDS catalog page for dataset b381a396-7d03-4a84-839d-1aa90076e44c
NCSS for dataset b381a396-7d03-4a84-839d-1aa90076e44c
NetCDF file download via HTTP for dataset b381a396-7d03-4a84-839d-1aa90076e44c
Zipped ERS file download via HTTP for dataset b381a396-7d03-4a84-839d-1aa90076e44c
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WMS for dataset b381a396-7d03-4a84-839d-1aa90076e44c
Australian Geophysical Archive Data Delivery System
This rNT0622tS.nc grid includes airborne-derived radiometric thorium equivalent data for the Urapunga, NT, 1994 survey acquired for the geological survey of NT