Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
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 0.00052 degrees (approximately 53m) and shows thorium element concentration of the Cootamundra, NSW, 1997/98 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1997 by the NSW Government, and consisted of 69086 line-kilometres of data at 250m line spacing and 80m terrain clearance.
Product Type
dataset
eCat Id
141478
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Data centre )
-
- NCI
- ( Discipline )
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- Earth sciences
- ( Discipline )
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- geophysics
- ( Feature type )
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- grid
- ( Place )
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- Australia
- ( Place )
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- NSW
- ( Project )
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- survey 681
- ( Theme )
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- GADDS2.0
- ( Theme )
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- radiometrics
- ( Theme )
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- NASVD
- ( Theme )
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- thorium
- ( Theme )
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- airborne digital data
- ( Theme )
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- geophysical survey
- ( Theme )
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- rad
- ( Theme )
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- Th
- ( Theme )
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- gamma-ray
- ( Theme )
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- spectrometry
- ( Theme )
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- grid
- ( Theme )
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- raster
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- Published_External
Publication Date
2020-03-07T00:00:00
Creation Date
2020-03-07T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This Cootamundra ppm thorium grid geodetic is an airborne-derived radiometric thorium grid for the Cootamundra, NSW, 1997/98. The survey was acquired under the project No. 681 for the geological survey of NSW. The grid has a cell size of 0.00052 degrees (approximately 53m). A total of 69086 line-kilometres of data at a line spacing of 250m and 80m terrain clearance were acquired to produce this grid. This radiometric thorium grid shows thorium element concentration of the Cootamundra, NSW, 1997/98 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).
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
Extents
[-35.0044, -33.9951, 146.9871, 148.5127]
Reference System
WGS84 (EPSG:4326)
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
This Cootamundra ppm thorium grid geodetic includes airborne-derived radiometric thorium data for the Cootamundra, NSW, 1997/98 acquired for the geological survey of NSW