Data

NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD

Name: NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD
Published: 2020

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=http://rhe-ecat-prod01.prod.lan:8080/geonetwork/srv/eng/search?uuid=f376e8e5-a121-46df-9a74-b984efe93687&rft.title=NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/143880&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. This NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the spheical cap Bouguer anomaly grid for the NTGS Victoria Basin Gravity Survey (P201582). This gravity survey was acquired under the project No. 201582 for the geological survey of NT. The grid has a cell size of 0.00735 degrees (approximately 800m). A total of 6172 gravity stations at 4000m spacing were acquired to produce this grid. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.Maintenance and Update Frequency: notPlannedStatement: This NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the spherical cap Bouguer anomaly grid for the NTGS Victoria Basin Gravity Survey (P201582). This gravity survey was acquired under the project No. 201582 for the geological survey of NT. The grid has a cell size of 0.00735 degrees (approximately 800m). A total of 6172 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 Spherical Cap Bouguer gravity anomalies were calculated by applying Bullard A and Bullard B corrections to the free air anomalies using a density of 2670 kg per cubic metre. These data were then gridded using the nearest neighbour algorithm from 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 NTGS Victoria Basin Gravity Survey (P201582) 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. The final Spherical cap Bouguer anomalies grid contains data values which account for a correction due to the shape or curvature of the Earth, and provide a more accurate representation of crustal density variations beneath the Earth's surface. 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=128.9511; southlimit=-17.3759; eastlimit=133.2134; northlimit=-14.6055; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=128.9511; southlimit=-17.3759; eastlimit=133.2134; northlimit=-14.6055; projection=GDA94 (EPSG:4283)&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/&rft_rights=(c) Northern Territory of Australia (Northern Territory Geological Survey) 2020&rft_rights=Australian Government Security ClassificationSystem https://www.protectivesecurity.gov.au/Pages/default.aspx&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=NT&rft_subject=survey 201582&rft_subject=GADDS2.0&rft_subject=gravity&rft_subject=spherical cap&rft_subject=Bouguer&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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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.
This NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the spheical cap Bouguer anomaly grid for the NTGS Victoria Basin Gravity Survey (P201582). This gravity survey was acquired under the project No. 201582 for the geological survey of NT. The grid has a cell size of 0.00735 degrees (approximately 800m). A total of 6172 gravity stations at 4000m spacing were acquired to produce this grid. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.

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Maintenance and Update Frequency: notPlanned

Statement: This NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the spherical cap Bouguer anomaly grid for the NTGS Victoria Basin Gravity Survey (P201582). This gravity survey was acquired under the project No. 201582 for the geological survey of NT. The grid has a cell size of 0.00735 degrees (approximately 800m). A total of 6172 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 Spherical Cap Bouguer gravity anomalies were calculated by applying Bullard A and Bullard B corrections to the free air anomalies using a density of 2670 kg per cubic metre. These data were then gridded using the nearest neighbour algorithm from 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 NTGS Victoria Basin Gravity Survey (P201582) 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. The final Spherical cap Bouguer anomalies grid contains data values which account for a correction due to the shape or curvature of the Earth, and provide a more accurate representation of crustal density variations beneath the Earth's surface. 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: 07 03 2020

Issued: 07 03 2020

Modified: 05 07 2021

Data time period: 14 08 2015 to 18 09 2015

This dataset is part of a larger collection

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text: westlimit=128.9511; southlimit=-17.3759; eastlimit=133.2134; northlimit=-14.6055; projection=GDA94 (EPSG:4283)

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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)

url : https://portal.ga.gov.au/persona/gadds External Link

File download for NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD file download)

url : https://thredds.nci.org.au/thredds/fileServer/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P201582/P201582-grid-grv_scba_1vd.nc External Link

NetCDF Subsetting Service (NCSS) for NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD NCSS)

url : https://thredds.nci.org.au/thredds/ncss/grid/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P201582/P201582-grid-grv_scba_1vd.nc/dataset.html External Link

OPeNDAP web service for NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD OPeNDAP)

url : https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P201582/P201582-grid-grv_scba_1vd.nc.html External Link

OGC Web Mapping Service (WMS) for NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD WMS)

url : https://thredds.nci.org.au/thredds/wms/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P201582/P201582-grid-grv_scba_1vd.nc?service=WMS&version=1.3.0&request=GetCapabilities External Link

OGC Web Coverage Service (WCS) for NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD WCS)

url : https://thredds.nci.org.au/thredds/wcs/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P201582/P201582-grid-grv_scba_1vd.nc?service=WCS&version=1.0.0&request=GetCapabilities External Link

NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD NCSS

NTGS Victoria Basin Gravity P201582 Spherical Cap Bouguer Anomaly 267GU 1VD OPeNDAP