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 0.0001 degrees (approximately 11m) and shows thorium element concentration of the West Wyalong Detail, NSW, 1998 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1998 by the NSW Government, and consisted of 7819 line-kilometres of data at a line spacing between 50m and 100m, and 60m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This West Wyalong ppm thorium grid geodeticg is an airborne-derived radiometric thorium grid for the West Wyalong Detail, NSW, 1998. The survey was acquired under the project No. 697 for the geological survey of NSW. The grid has a cell size of 0.0001 degrees (approximately 11m). A total of 7819 line-kilometres of data at a line spacing between 50m and 100, and 60m terrain clearance were acquired to produce this grid. This radiometric thorium grid shows thorium element concentration of the West Wyalong Detail, NSW, 1998 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: 10 11 1998 to 14 11 1998
text: westlimit=147.053; southlimit=-33.9193; eastlimit=147.3381; northlimit=-33.6993; projection=WGS84 (EPSG:4326)
Subjects
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NASVD |
NCI |
NSW |
Published_External |
Th |
airborne digital data |
gamma-ray |
geophysical survey |
geophysics |
geoscientificInformation |
grid |
rad |
radiometrics |
raster |
spectrometry |
survey 697 |
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 West Wyalong ppm thorium grid geodeticg (West Wyalong ppm thorium grid geodeticg file download)
NetCDF Subsetting Service (NCSS) for West Wyalong ppm thorium grid geodeticg (West Wyalong ppm thorium grid geodeticg NCSS)
OPeNDAP web service for West Wyalong ppm thorium grid geodeticg (West Wyalong ppm thorium grid geodeticg OPeNDAP)
OGC Web Mapping Service (WMS) for West Wyalong ppm thorium grid geodeticg (West Wyalong ppm thorium grid geodeticg WMS)
OGC Web Coverage Service (WCS) for West Wyalong ppm thorium grid geodeticg (West Wyalong ppm thorium grid geodeticg WCS)
West Wyalong ppm thorium grid geodeticg NCSS
West Wyalong ppm thorium grid geodeticg OPeNDAP
West Wyalong ppm thorium grid geodeticg WMS
West Wyalong ppm thorium grid geodeticg WCS
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/141402
- global : 0d3ca7c0-c138-4c1a-83ef-a1d970a106fd
