Data

Westmoreland Complete Spherical Cap Bouguer 1VD geodetic

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=https://pid.geoscience.gov.au/dataset/ga/143990&rft.title=Westmoreland Complete Spherical Cap Bouguer 1VD geodetic&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/143990&rft.description=Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. 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 Westmoreland Complete Spherical Cap Bouguer 1VD geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Westmoreland-Normanton Gravity Survey (P200840). This gravity survey was acquired under the project No. 200840 for the geological survey of QLD. The grid has a cell size of 0.0074 degrees (approximately 803m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 6414 gravity stations at a spacing between 2000m and 4000m were acquired to produce this grid.Maintenance and Update Frequency: notPlannedStatement: This Westmoreland Complete Spherical Cap Bouguer 1VD geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Westmoreland-Normanton Gravity Survey (P200840). This gravity survey was acquired under the project No. 200840 for the geological survey of QLD. The grid has a cell size of 0.0074 degrees (approximately 803m). A total of 6414 gravity stations at a spacing between 2000m and 4000m were acquired to produce this grid. Three processes are required to correct the gravity observations for the effects of the surrounding topography: (1) a Bouguer correction (Bullard A), which approximates the topography as an infinite horizontal slab; (2) a correction to that horizontal slab for the curvature of the Earth (Bullard B); and (3) a terrain correction (Bullard C), which accounts for the undulations of the surrounding topography. The complete spherical cap Bouguer gravity anomalies were calculated by applying terrain correction (Bullard C) to the spherical cap Bouguer anomaly point data of Westmoreland-Normanton Gravity Survey (P200840). These terrain corrections were calculated using software from INTREPID Geophysics. The Intrepid algorithm utilises concentric rings subdivided into cells (Direen, 2001) to calculate the terrain correction. The terrain corrected data were then gridded using a gridding technique provided by the INTREPID Geophysics software package. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the Bouguer gravity grid of the Westmoreland-Normanton Gravity Survey (P200840) survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose. Details of the specifications of individual surveys held in the Australian National Gravity Database (ANGD) can be found in the Second Edition of the Index of Gravity Surveys (Wynne and Bacchin, 2009). References: Intrepid Geophysics, http://www.intrepid-geophysics.com; Wynne, P. and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2020&rft.coverage=westlimit=137.9655; southlimit=-18.1228; eastlimit=144.0335; northlimit=-15.8658; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=137.9655; southlimit=-18.1228; eastlimit=144.0335; northlimit=-15.8658; projection=GDA94 (EPSG:4283)&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) Geological Survey of Queensland 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=QLD&rft_subject=survey 200840&rft_subject=GADDS2.0&rft_subject=gravity&rft_subject=spherical cap&rft_subject=Bouguer&rft_subject=complete&rft_subject=1VD&rft_subject=first vertical derivative&rft_subject=ground digital data&rft_subject=geophysical survey&rft_subject=grav&rft_subject=raster&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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(c) Geological Survey of Queensland 2020

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Brief description

Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. 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 Westmoreland Complete Spherical Cap Bouguer 1VD geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Westmoreland-Normanton Gravity Survey (P200840). This gravity survey was acquired under the project No. 200840 for the geological survey of QLD. The grid has a cell size of 0.0074 degrees (approximately 803m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 6414 gravity stations at a spacing between 2000m and 4000m were acquired to produce this grid.

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Maintenance and Update Frequency: notPlanned
Statement: This Westmoreland Complete Spherical Cap Bouguer 1VD geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Westmoreland-Normanton Gravity Survey (P200840). This gravity survey was acquired under the project No. 200840 for the geological survey of QLD. The grid has a cell size of 0.0074 degrees (approximately 803m). A total of 6414 gravity stations at a spacing between 2000m and 4000m were acquired to produce this grid. Three processes are required to correct the gravity observations for the effects of the surrounding topography: (1) a Bouguer correction (Bullard A), which approximates the topography as an infinite horizontal slab; (2) a correction to that horizontal slab for the curvature of the Earth (Bullard B); and (3) a terrain correction (Bullard C), which accounts for the undulations of the surrounding topography. The complete spherical cap Bouguer gravity anomalies were calculated by applying terrain correction (Bullard C) to the spherical cap Bouguer anomaly point data of Westmoreland-Normanton Gravity Survey (P200840). These terrain corrections were calculated using software from INTREPID Geophysics. The Intrepid algorithm utilises concentric rings subdivided into cells (Direen, 2001) to calculate the terrain correction. The terrain corrected data were then gridded using a gridding technique provided by the INTREPID Geophysics software package. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the Bouguer gravity grid of the Westmoreland-Normanton Gravity Survey (P200840) survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose. Details of the specifications of individual surveys held in the Australian National Gravity Database (ANGD) can be found in the Second Edition of the Index of Gravity Surveys (Wynne and Bacchin, 2009). References: Intrepid Geophysics, http://www.intrepid-geophysics.com; Wynne, P. and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.

Created: 09 03 2020

Issued: 09 03 2020

Modified: 05 07 2021

Data time period: 16 06 2008 to 16 08 2008

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144.0335,-15.8658 144.0335,-18.1228 137.9655,-18.1228 137.9655,-15.8658 144.0335,-15.8658

140.9995,-16.9943

text: westlimit=137.9655; southlimit=-18.1228; eastlimit=144.0335; northlimit=-15.8658; projection=GDA94 (EPSG:4283)

Subjects
1VD | Australia | Bouguer | EARTH SCIENCES | Earth sciences | GADDS2.0 | NCI | Published_External | QLD | complete | first vertical derivative | geophysical survey | geophysics | geoscientificInformation | grav | gravity | grid | ground digital data | raster | spherical cap | survey 200840 |

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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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