Radiometric potassium grid of Lake Grace, WA, 1995 survey
Authors / CoAuthors
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 potassium grid has a cell size of 0.000417 degrees (approximately 40m) and shows potassium element concentration of the Lake Grace, WA, 1995 survey. The data used to produce this grid was acquired in 1995 by the WA Government, and consisted of 4388 line-kilometres of data at 200m line spacing and 60m terrain clearance.
Australian Government Security ClassificationSystem
Classification - unclassified
Creative Commons Attribution 4.0 International Licence
Access - license
Use - license
This rWA1069k.nc grid is an airborne-derived radiometric potassium grid for the Lake Grace, WA, 1995 survey. The survey was acquired under the project No. 1069 for the geological survey of WA. The grid has a cell size of 0.000417 degrees (approximately 40m). A total of 4388 line-kilometres of data at a line spacing of 200m 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 b771d29f-de4e-46ab-bab0-8308585128c2
NetCDF file on NCI filesystem for dataset b771d29f-de4e-46ab-bab0-8308585128c2
THREDDS catalog page for dataset b771d29f-de4e-46ab-bab0-8308585128c2
NCSS for dataset b771d29f-de4e-46ab-bab0-8308585128c2
NetCDF file download via HTTP for dataset b771d29f-de4e-46ab-bab0-8308585128c2
Zipped ERS file download via HTTP for dataset b771d29f-de4e-46ab-bab0-8308585128c2
OPeNDAP service for dataset b771d29f-de4e-46ab-bab0-8308585128c2
WCS for dataset b771d29f-de4e-46ab-bab0-8308585128c2
WMS for dataset b771d29f-de4e-46ab-bab0-8308585128c2
Australian Geophysical Archive Data Delivery System
This rWA1069k.nc grid includes airborne-derived radiometric potassium data for the Lake Grace, WA, 1995 survey acquired for the geological survey of WA