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 0.00042 degrees (approximately 45m) and shows thorium element concentration of the Georgetown, Qld, 1998/99 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1998 by the QLD Government, and consisted of 65969 line-kilometres of data at 200m line spacing and 80m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This Georgetown ppm thorium grid geodetichg is an airborne-derived radiometric thorium grid for the Georgetown, Qld, 1998/99. The survey was acquired under the project No. 666 for the geological survey of QLD. The grid has a cell size of 0.00042 degrees (approximately 45m). A total of 65969 line-kilometres of data at a line spacing of 200m and 80m terrain clearance were acquired to produce this grid. This radiometric thorium grid shows thorium element concentration of the Georgetown, Qld, 1998/99 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: 06 07 2021
Data time period: 07 09 1998 to 15 11 1998
text: westlimit=142.9798; southlimit=-19.0198; eastlimit=144.0198; northlimit=-17.9798; projection=WGS84 (EPSG:4326)
Subjects
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NASVD |
NCI |
Published_External |
QLD |
Th |
airborne digital data |
gamma-ray |
geophysical survey |
geophysics |
geoscientificInformation |
grid |
rad |
radiometrics |
raster |
spectrometry |
survey 666 |
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 Georgetown ppm thorium grid geodetichg (Georgetown ppm thorium grid geodetichg file download)
NetCDF Subsetting Service (NCSS) for Georgetown ppm thorium grid geodetichg (Georgetown ppm thorium grid geodetichg NCSS)
OPeNDAP web service for Georgetown ppm thorium grid geodetichg (Georgetown ppm thorium grid geodetichg OPeNDAP)
OGC Web Mapping Service (WMS) for Georgetown ppm thorium grid geodetichg (Georgetown ppm thorium grid geodetichg WMS)
OGC Web Coverage Service (WCS) for Georgetown ppm thorium grid geodetichg (Georgetown ppm thorium grid geodetichg WCS)
Georgetown ppm thorium grid geodetichg NCSS
Georgetown ppm thorium grid geodetichg OPeNDAP
Georgetown ppm thorium grid geodetichg WMS
Georgetown ppm thorium grid geodetichg WCS
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/141505
- global : f824a4ba-1ab9-4ca4-97a6-629be4f85bf8
