Data

South East Lachlan Gravity (CSCBA)

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/144798&rft.title=South East Lachlan Gravity (CSCBA)&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/144798&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 South East Lachlan Gravity (CSCBA) is a complete spherical cap Bouguer anomaly grid for the South East Lachlan Gravity Survey along Seismic Lines, P201930, Vic, NSW, 2019. This gravity survey was acquired under the project No. 201930 for the geological survey of NSW, VIC. The grid has a cell size of 0.0005 degrees (approximately 50m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 3542 gravity stations were acquired to produce this grid.Maintenance and Update Frequency: notPlannedStatement: This South East Lachlan Gravity (CSCBA) is a complete spherical cap Bouguer anomaly grid for the South East Lachlan Gravity Survey along Seismic Lines, P201930, Vic, NSW, 2019. This gravity survey was acquired under the project No. 201930 for the geological survey of NSW, VIC. The grid has a cell size of 0.0005 degrees (approximately 50m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 3542 gravity stations 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 South East Lachlan Gravity Survey along Seismic Lines, P201930, Vic, NSW, 2019. 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. 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; Direen, N.G., 2001. Application of terrain corrections in Australia. Geoscience Australia, Canberra. https://pid.geoscience.gov.au/dataset/ga/33808; 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=145.7993; southlimit=-37.2656; eastlimit=150.0063; northlimit=-36.0578; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=145.7993; southlimit=-37.2656; eastlimit=150.0063; northlimit=-36.0578; 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) State of Victoria (Geological Survey of Victoria) 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=NSW&rft_subject=VIC&rft_subject=survey 201930&rft_subject=GADDS2.0&rft_subject=gravity&rft_subject=spherical cap&rft_subject=Bouguer&rft_subject=complete&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) State of Victoria (Geological Survey of Victoria) 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 South East Lachlan Gravity (CSCBA) is a complete spherical cap Bouguer anomaly grid for the South East Lachlan Gravity Survey along Seismic Lines, P201930, Vic, NSW, 2019. This gravity survey was acquired under the project No. 201930 for the geological survey of NSW, VIC. The grid has a cell size of 0.0005 degrees (approximately 50m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 3542 gravity stations were acquired to produce this grid.

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Maintenance and Update Frequency: notPlanned
Statement: This South East Lachlan Gravity (CSCBA) is a complete spherical cap Bouguer anomaly grid for the South East Lachlan Gravity Survey along Seismic Lines, P201930, Vic, NSW, 2019. This gravity survey was acquired under the project No. 201930 for the geological survey of NSW, VIC. The grid has a cell size of 0.0005 degrees (approximately 50m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 3542 gravity stations 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 South East Lachlan Gravity Survey along Seismic Lines, P201930, Vic, NSW, 2019. 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. 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; Direen, N.G., 2001. Application of terrain corrections in Australia. Geoscience Australia, Canberra. https://pid.geoscience.gov.au/dataset/ga/33808; Wynne, P. and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.

Created: 31 10 2020

Issued: 31 10 2020

Modified: 05 07 2021

Data time period: 20 05 2019 to 29 06 2019

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150.0063,-36.0578 150.0063,-37.2656 145.7993,-37.2656 145.7993,-36.0578 150.0063,-36.0578

147.9028,-36.6617

text: westlimit=145.7993; southlimit=-37.2656; eastlimit=150.0063; northlimit=-36.0578; projection=GDA94 (EPSG:4283)

Subjects
Australia | Bouguer | EARTH SCIENCES | Earth sciences | GADDS2.0 | NCI | NSW | Published_External | VIC | complete | geophysical survey | geophysics | geoscientificInformation | grav | gravity | grid | ground digital data | raster | spherical cap | survey 201930 |

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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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