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NTGS Daly Basin Gravity P201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD

Name: NTGS Daly Basin Gravity P201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD
Published: 2020

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://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/371c2a61-336f-400c-971a-dcefbac9dc83&rft.title=NTGS Daly Basin Gravity P201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/143869&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 NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the NTGS Daly Basin Gravity Survey 2016 (P201680). This gravity survey was acquired under the project No. 201680 for the geological survey of NT. The grid has a cell size of 0.00732 degrees (approximately 800m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 2271 gravity stations at a spacing between 4000m and 1000m were acquired to produce this grid.Maintenance and Update Frequency: notPlannedStatement: This NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the NTGS Daly Basin Gravity Survey 2016 (P201680). This gravity survey was acquired under the project No. 201680 for the geological survey of NT. The grid has a cell size of 0.00732 degrees (approximately 800m). A total of 2271 gravity stations at a spacing between 4000m and 1000m 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 NTGS Daly Basin Gravity Survey 2016 (P201680). 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 NTGS Daly Basin Gravity Survey 2016 (P201680) 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=129.3139; southlimit=-14.9138; eastlimit=132.9507; northlimit=-13.2381; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=129.3139; southlimit=-14.9138; eastlimit=132.9507; northlimit=-13.2381; 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 201680&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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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 NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the NTGS Daly Basin Gravity Survey 2016 (P201680). This gravity survey was acquired under the project No. 201680 for the geological survey of NT. The grid has a cell size of 0.00732 degrees (approximately 800m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 2271 gravity stations at a spacing between 4000m and 1000m were acquired to produce this grid.

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Maintenance and Update Frequency: notPlanned

Statement: This NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the NTGS Daly Basin Gravity Survey 2016 (P201680). This gravity survey was acquired under the project No. 201680 for the geological survey of NT. The grid has a cell size of 0.00732 degrees (approximately 800m). A total of 2271 gravity stations at a spacing between 4000m and 1000m 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 NTGS Daly Basin Gravity Survey 2016 (P201680). 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 NTGS Daly Basin Gravity Survey 2016 (P201680) 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: 07 03 2020

Issued: 07 03 2020

Modified: 05 07 2021

Data time period: 13 07 2016 to 06 08 2016

This dataset is part of a larger collection

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text: westlimit=129.3139; southlimit=-14.9138; eastlimit=132.9507; northlimit=-13.2381; 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)

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url : https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P201680/P201680-grid-grv_cscba_1vd.nc.html External Link

OGC Web Mapping Service (WMS) for NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Daly Basin Gravity PP201680 Complete 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/P201680/P201680-grid-grv_cscba_1vd.nc?service=WMS&version=1.3.0&request=GetCapabilities External Link

OGC Web Coverage Service (WCS) for NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD (NTGS Daly Basin Gravity PP201680 Complete 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/P201680/P201680-grid-grv_cscba_1vd.nc?service=WCS&version=1.0.0&request=GetCapabilities External Link

NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD NCSS

NTGS Daly Basin Gravity PP201680 Complete Spherical Cap Bouguer Anomaly 267GU 1VD OPeNDAP