Data

Cambridge Gulf total count grid geodetic

Geoscience Australia
Geophysical Acquisition & Processing Section
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/141621&rft.title=Cambridge Gulf total count grid geodetic&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/141621&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. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to this grid to generate the filtered terrestrial dose rate grid. This Cambridge Gulf total count grid geodetic has a cell size of 0.00083 degrees (approximately 91m) and shows the terrestrial dose rate of the Cambridge Gulf, WA, 1994. The data used to produce this grid was acquired in 1994 by the WA Government, and consisted of 51219 line-kilometres of data at 400m line spacing and 60m terrain clearance.Maintenance and Update Frequency: notPlannedStatement: This Cambridge Gulf total count grid geodetic is an airborne-derived radiometric terrestrial dose rate grid for the Cambridge Gulf, WA, 1994 survey. The survey was acquired under the project No. 635 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 91m). A total of 51219 line-kilometres of data at a line spacing of 400m were acquired to produce this grid. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. 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).&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2020&rft.coverage=westlimit=127.4693; southlimit=-16.0326; eastlimit=129.0217; northlimit=-14.9577; projection=WGS84 (EPSG:4326)&rft.coverage=westlimit=127.4693; southlimit=-16.0326; eastlimit=129.0217; northlimit=-14.9577; projection=WGS84 (EPSG:4326)&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=(c) Commonwealth of Australia (Geoscience Australia) 2020&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=EARTH SCIENCES&rft_subject=NCI&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=grid&rft_subject=Australia&rft_subject=WA&rft_subject=survey 635&rft_subject=GADDS2.0&rft_subject=radiometrics&rft_subject=NASVD&rft_subject=thorium&rft_subject=uranium&rft_subject=potassium&rft_subject=dose rate&rft_subject=dose&rft_subject=rate&rft_subject=airborne digital data&rft_subject=geophysical survey&rft_subject=rad&rft_subject=K&rft_subject=Th&rft_subject=U&rft_subject=gamma-ray&rft_subject=spectrometry&rft_subject=raster&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

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(c) Commonwealth of Australia (Geoscience Australia) 2020

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

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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. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to this grid to generate the filtered terrestrial dose rate grid. This Cambridge Gulf total count grid geodetic has a cell size of 0.00083 degrees (approximately 91m) and shows the terrestrial dose rate of the Cambridge Gulf, WA, 1994. The data used to produce this grid was acquired in 1994 by the WA Government, and consisted of 51219 line-kilometres of data at 400m line spacing and 60m terrain clearance.

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Maintenance and Update Frequency: notPlanned
Statement: This Cambridge Gulf total count grid geodetic is an airborne-derived radiometric terrestrial dose rate grid for the Cambridge Gulf, WA, 1994 survey. The survey was acquired under the project No. 635 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 91m). A total of 51219 line-kilometres of data at a line spacing of 400m were acquired to produce this grid. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. 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: 04 1994 to 30 04 1994

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129.0217,-14.9577 129.0217,-16.0326 127.4693,-16.0326 127.4693,-14.9577 129.0217,-14.9577

128.2455,-15.49515

text: westlimit=127.4693; southlimit=-16.0326; eastlimit=129.0217; northlimit=-14.9577; projection=WGS84 (EPSG:4326)

Subjects
Australia | EARTH SCIENCES | Earth sciences | GADDS2.0 | K | NASVD | NCI | Published_External | Th | U | WA | airborne digital data | dose | dose rate | gamma-ray | geophysical survey | geophysics | geoscientificInformation | grid | potassium | rad | radiometrics | raster | rate | spectrometry | survey 635 | thorium | uranium |

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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)

uri : https://portal.ga.gov.au/persona/gadds

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