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 potassium grid has a cell size of 0.0005 degrees (approximately 50m) and shows potassium element concentration of the Kakadu Detail Airborne, NT, 1988 survey. The data used to produce this grid was acquired in 1988 by the NT Government, and consisted of 19030 line-kilometres of data at 250m line spacing and 100m terrain clearance.
Product Type
dataset
eCat Id
105923
Contact for the resource
Owner
Custodian
Point of contact
Digital Object Identifier
Keywords
- ( Theme )
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- radiometrics
- ( Theme )
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- potassium
- ( Theme )
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- airborne digital data
- ( Theme )
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- geophysical survey
- ( Project )
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- survey 544
- ( Theme )
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- AWAGS
- ( Data centre )
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- 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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- NT
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- Published_External
Publication Date
2011-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This rNT0544k.nc grid is an airborne-derived radiometric potassium grid for the Kakadu Detail Airborne, NT, 1988 survey. The survey was acquired under the project No. 544 for the geological survey of NT. The grid has a cell size of 0.0005 degrees (approximately 50m). A total of 19030 line-kilometres of data at a line spacing of 250m 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. References 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).
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
Extents
[-13.741748, -12.998248, 131.955485, 132.971485]
Reference System
WGS 84 (geocentric) (EPSG:4328)
Spatial Resolution
Service Information
Associations
Downloads and Links
Digital Object Identifier for dataset 293de709-4131-4b11-a064-c6c508e736cd
NetCDF file on NCI filesystem for dataset 293de709-4131-4b11-a064-c6c508e736cd
THREDDS catalog page for dataset 293de709-4131-4b11-a064-c6c508e736cd
NCSS for dataset 293de709-4131-4b11-a064-c6c508e736cd
NetCDF file download via HTTP for dataset 293de709-4131-4b11-a064-c6c508e736cd
Zipped ERS file download via HTTP for dataset 293de709-4131-4b11-a064-c6c508e736cd
OPeNDAP service for dataset 293de709-4131-4b11-a064-c6c508e736cd
WCS for dataset 293de709-4131-4b11-a064-c6c508e736cd
Source Information
This rNT0544k.nc grid includes airborne-derived radiometric potassium data for the Kakadu Detail Airborne, NT, 1988 survey acquired for the geological survey of NT