Dataset

Radiometric thorium equivalent grid of Murchison 2 (Perenjori), WA, 2011 survey

Geoscience Australia
Geophysical Acquisition & Processing Section
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://pid.geoscience.gov.au/dataset/ga/107118&rft.title=Radiometric thorium equivalent grid of Murchison 2 (Perenjori), WA, 2011 survey&rft.identifier=http://pid.geoscience.gov.au/dataset/ga/107118&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.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 0.000417 degrees (approximately 40m) and shows thorium element concentration of the Murchison 2 (Perenjori), WA, 2011 survey. The data used to produce this grid was acquired in 2012 by the WA Government, and consisted of 121425 line-kilometres of data at 200m line spacing and 50m terrain clearance.This rWA1238t.nc grid is an airborne-derived radiometric thorium equivalent grid for the Murchison 2 (Perenjori), WA, 2011 survey. The survey was acquired under the project No. 1238 for the geological survey of WA. The grid has a cell size of 0.000417 degrees (approximately 40m). A total of 121425 line-kilometres of data at a line spacing of 200m 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).&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2011&rft.coverage=northlimit=-28.493125; southlimit=-30.006835; westlimit=115.343125; eastLimit=117.006955&rft.coverage=northlimit=-28.493125; southlimit=-30.006835; westlimit=115.343125; eastLimit=117.006955&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=radiometrics&rft_subject=thorium&rft_subject=airborne digital data&rft_subject=geophysical survey&rft_subject=survey 1238&rft_subject=AWAGS&rft_subject=NCI&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=grid&rft_subject=Australia&rft_subject=WA&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Access:

Open

Contact Information

clientservices@ga.gov.au

Brief 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 0.000417 degrees (approximately 40m) and shows thorium element concentration of the Murchison 2 (Perenjori), WA, 2011 survey. The data used to produce this grid was acquired in 2012 by the WA Government, and consisted of 121425 line-kilometres of data at 200m line spacing and 50m terrain clearance.

Lineage

This rWA1238t.nc grid is an airborne-derived radiometric thorium equivalent grid for the Murchison 2 (Perenjori), WA, 2011 survey. The survey was acquired under the project No. 1238 for the geological survey of WA. The grid has a cell size of 0.000417 degrees (approximately 40m). A total of 121425 line-kilometres of data at a line spacing of 200m 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).

Issued: 2011

Data time period: 2011-10-21 to 2012-01-12

117.006955,-28.493125 117.006955,-30.006835 115.343125,-30.006835 115.343125,-28.493125 117.006955,-28.493125

116.17504,-29.24998

text: northlimit=-28.493125; southlimit=-30.006835; westlimit=115.343125; eastLimit=117.006955

Subjects

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Other Information
Digital Object Identifier for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb

doi : http://dx.doi.org/10.4225/25/58a3f6c3f1972

Fully qualified pathname of NetCDF file on NCI filesystem for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb. Users must be logged onto the NCI network to access this file system. (md5sum=1609100b293ac9486207f6d5acfccfa0) (NetCDF file on NCI filesystem for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb)

local : file:///g/data1/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc

THREDDS catalog page for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb

uri : http://dapds00.nci.org.au/thredds/catalog/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/catalog.html

URI : http://dapds00.nci.org.au/thredds/catalog/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/catalog.html?dataset=rr2-Airborne/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc

NetCDF Subset Service for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb (NCSS for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/ncss/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc/dataset.html

NetCDF file download via HTTP for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/fileServer/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc

Zipped ERS file download via HTTP for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/fileServer/rr2/airborne_geophysics/http/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.ers.zip

OPeNDAP landing page for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb (OPeNDAP service for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/dodsC/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc.html

OGC Web Coverage Service for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb (WCS for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/wcs/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc

OGC Web Mapping Service for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb (WMS for dataset 288cbb10-6ec3-43ae-a426-d2c131a838fb)

uri : http://dapds00.nci.org.au/thredds/catalog.html

URI : http://dapds00.nci.org.au/thredds/wms/rr2/airborne_geophysics/WA/P1238/radiometrics/thorium/grid/rWA1238t/rWA1238t.nc

Download from Geoscience Australia Geophysical Archive Data Delivery System (Australian Geophysical Archive Data Delivery System)

uri : http://www.geoscience.gov.au/cgi-bin/mapserv

URI : http://www.geoscience.gov.au/cgi-bin/mapserv?map=/nas/web/ops/prod/apps/mapserver/gadds/wms_map/gadds.map

Identifiers
  • global : 288cbb10-6ec3-43ae-a426-d2c131a838fb