Radiometric thorium equivalent grid of SW Canning Basin (La Grange, Munro, Mandora), WA, 1989 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 0.004 degrees (approximately 430m) and shows thorium element concentration of the SW Canning Basin (La Grange, Munro, Mandora), WA, 1989 survey. The data used to produce this grid was acquired in 1989 by the WA Government, and consisted of 37055 line-kilometres of data at 1500m line spacing and 150m terrain clearance.
Australian Government Security ClassificationSystem
Classification - unclassified
Creative Commons Attribution 4.0 International Licence
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This rWA0550t.nc grid is an airborne-derived radiometric thorium equivalent grid for the SW Canning Basin (La Grange, Munro, Mandora), WA, 1989 survey. The survey was acquired under the project No. 550 for the geological survey of WA. The grid has a cell size of 0.004 degrees (approximately 430m). A total of 37055 line-kilometres of data at a line spacing of 1500m 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)
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Digital Object Identifier for dataset 27f50e8b-f50e-4b6a-89bc-50f8bbb16bdf
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Australian Geophysical Archive Data Delivery System
This rWA0550t.nc grid includes airborne-derived radiometric thorium equivalent data for the SW Canning Basin (La Grange, Munro, Mandora), WA, 1989 survey acquired for the geological survey of WA