Full description
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 0.00083 degrees (approximately 83m) and shows thorium element concentration of the Ararat-Ballarat merge, 1990-1992 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1990 by the VIC Government, and consisted of 51328 line-kilometres of data at a line spacing between 200m and 400m, and 100m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This Ararat Ballarat thorium grid geodetic is an airborne-derived radiometric thorium grid for the Ararat-Ballarat merge, 1990-1992. The survey was acquired under the project No. 1344 for the geological survey of VIC. The grid has a cell size of 0.00083 degrees (approximately 83m). A total of 51328 line-kilometres of data at a line spacing between 200m and 400, and 100m terrain clearance were acquired to produce this grid. This radiometric thorium grid shows thorium element concentration of the Ararat-Ballarat merge, 1990-1992 in units of parts per million (or ppm). Noise-adjusted singular value decomposition (NASVD) has been applied to the data. NASVD is a spectral component analysis procedure for the removal of noise from gamma-ray spectra. 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.
Reference:
Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Created: 07 03 2020
Issued: 07 03 2020
Modified: 05 07 2021
Data time period: 05 01 1990 to 27 04 1992
text: westlimit=142.3996; southlimit=-38.0504; eastlimit=144.0504; northlimit=-36.9496; projection=AGD66 (EPSG:4202)
Subjects
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NASVD |
NCI |
Published_External |
Th |
VIC |
airborne digital data |
gamma-ray |
geophysical survey |
geophysics |
geoscientificInformation |
grid |
rad |
radiometrics |
raster |
spectrometry |
survey 1344 |
thorium |
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Other Information
The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. (File available for download in various formats from the GADDS2 portal)
url :
https://portal.ga.gov.au/persona/gadds
File download for Ararat Ballarat thorium grid geodetic (Ararat Ballarat thorium grid geodetic file download)
NetCDF Subsetting Service (NCSS) for Ararat Ballarat thorium grid geodetic (Ararat Ballarat thorium grid geodetic NCSS)
OPeNDAP web service for Ararat Ballarat thorium grid geodetic (Ararat Ballarat thorium grid geodetic OPeNDAP)
OGC Web Mapping Service (WMS) for Ararat Ballarat thorium grid geodetic (Ararat Ballarat thorium grid geodetic WMS)
OGC Web Coverage Service (WCS) for Ararat Ballarat thorium grid geodetic (Ararat Ballarat thorium grid geodetic WCS)
Ararat Ballarat thorium grid geodetic NCSS
Ararat Ballarat thorium grid geodetic OPeNDAP
Ararat Ballarat thorium grid geodetic WMS
Ararat Ballarat thorium grid geodetic WCS
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/143378
- global : 7719ec4b-eabb-484c-9247-993a5cdbfc3f
