Data

Galilee Complete Spherical Cap 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/143963&rft.title=Galilee Complete Spherical Cap 1vd geodetic&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/143963&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 Galilee Complete Spherical Cap 1vd geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Galilee Gravity Survey (P201040). This gravity survey was acquired under the project No. 201040 for the geological survey of QLD. The grid has a cell size of 0.007 degrees (approximately 748m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 6523 gravity stations at 4000m spacing were acquired to produce this grid.Maintenance and Update Frequency: notPlannedStatement: This Galilee Complete Spherical Cap 1vd geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Galilee Gravity Survey (P201040). This gravity survey was acquired under the project No. 201040 for the geological survey of QLD. The grid has a cell size of 0.007 degrees (approximately 748m). A total of 6523 gravity stations at 4000m spacing 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 Galilee Gravity Survey (P201040). 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 Galilee Gravity Survey (P201040) 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=142.9333; southlimit=-24.524; eastlimit=148.0153; northlimit=-20.758; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=142.9333; southlimit=-24.524; eastlimit=148.0153; northlimit=-20.758; 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 201040&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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Creative Commons Attribution 4.0 International Licence
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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 Galilee Complete Spherical Cap 1vd geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Galilee Gravity Survey (P201040). This gravity survey was acquired under the project No. 201040 for the geological survey of QLD. The grid has a cell size of 0.007 degrees (approximately 748m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 6523 gravity stations at 4000m spacing were acquired to produce this grid.

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Maintenance and Update Frequency: notPlanned
Statement: This Galilee Complete Spherical Cap 1vd geodetic is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Galilee Gravity Survey (P201040). This gravity survey was acquired under the project No. 201040 for the geological survey of QLD. The grid has a cell size of 0.007 degrees (approximately 748m). A total of 6523 gravity stations at 4000m spacing 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 Galilee Gravity Survey (P201040). 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 Galilee Gravity Survey (P201040) 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: 03 05 2011 to 11 07 2011

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148.0153,-20.758 148.0153,-24.524 142.9333,-24.524 142.9333,-20.758 148.0153,-20.758

145.4743,-22.641

text: westlimit=142.9333; southlimit=-24.524; eastlimit=148.0153; northlimit=-20.758; 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 201040 |

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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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