Data

NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um

Name: NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um
Published: 2023

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=info:doi10.26186/149439&rft.title=NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um&rft.identifier=10.26186/149439&rft.publisher=Commonwealth of Australia (Geoscience Australia)&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 Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um is a complete Bouguer anomaly grid for the NTGS Pedirka Gravity Survey (P202381) survey. This gravity survey was acquired under the project No. 202381 for the geological survey of NT. The grid has a cell size of 0.00944 degrees (approximately 1000m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 11443 gravity stations were acquired to produce this grid.Maintenance and Update Frequency: notPlannedStatement: This NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um is a spherical cap Bouguer anomaly grid for the NTGS Pedirka Gravity Survey (P202381). This gravity survey was acquired under the project No. 202381 for the geological survey of NT. The grid has a cell size of 0.00944 degrees (approximately 1000m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 11443 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 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. 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=2023&rft.coverage=westlimit=134.0137145885228; southlimit=-26.00125380161288; eastlimit=138.0249293989403; northlimit=-24.10418515009778; projection=GDA94 (EPSG:4283)&rft.coverage=westlimit=134.0137145885228; southlimit=-26.00125380161288; eastlimit=138.0249293989403; northlimit=-24.10418515009778; projection=GDA94 (EPSG:4283)&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/&rft_rights=Commonwealth of Australia (Geoscience Australia) and Northern Territory of Australia (Northern Territory Geological Survey) 2023&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 202381&rft_subject=GADDS2.0&rft_subject=gravity&rft_subject=spherical cap&rft_subject=Bouguer&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 Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um is a complete Bouguer anomaly grid for the NTGS Pedirka Gravity Survey (P202381) survey. This gravity survey was acquired under the project No. 202381 for the geological survey of NT. The grid has a cell size of 0.00944 degrees (approximately 1000m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 11443 gravity stations were acquired to produce this grid.

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Maintenance and Update Frequency: notPlanned

Statement: This NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um is a spherical cap Bouguer anomaly grid for the NTGS Pedirka Gravity Survey (P202381). This gravity survey was acquired under the project No. 202381 for the geological survey of NT. The grid has a cell size of 0.00944 degrees (approximately 1000m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 11443 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 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. 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.

Notes

Purpose
The Pedirka gravimetric survey was carried out as part of the exploration for the future (EFTF) program as a collaboration between the Northern Territory Geological Survey (NTGS) and Geoscience Australia. This survey forms part of the NTGS’s Resourcing the Territory Initiative, which aims to support resource exploration in the NT.

Created: 04 10 2023

Issued: 04 10 2023

Modified: 12 04 2024

Data time period: 30 05 2023 to 08 09 2023

This dataset is part of a larger collection

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text: westlimit=134.0137145885228; southlimit=-26.00125380161288; eastlimit=138.0249293989403; northlimit=-24.10418515009778; 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 Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um (NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um file download)

url : https://thredds.nci.org.au/thredds/fileServer/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P202381/202381_Pedirka_Gravity_SCBA267GU.nc External Link

NetCDF Subsetting Service (NCSS) for NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um (NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um NCSS)

url : https://thredds.nci.org.au/thredds/ncss/grid/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P202381/202381_Pedirka_Gravity_SCBA267GU.nc/dataset.html External Link

OPeNDAP web service for NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um (NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um OPeNDAP)

url : https://thredds.nci.org.au/thredds/dodsC/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P202381/202381_Pedirka_Gravity_SCBA267GU.nc.html External Link

OGC Web Mapping Service (WMS) for NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um (NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um WMS)

url : https://thredds.nci.org.au/thredds/wms/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P202381/202381_Pedirka_Gravity_SCBA267GU.nc?service=WMS&version=1.3.0&request=GetCapabilities External Link

OGC Web Coverage Service (WCS) for NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um (NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um WCS)

url : https://thredds.nci.org.au/thredds/wcs/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/ground_gravity/NT/grid/P202381/202381_Pedirka_Gravity_SCBA267GU.nc?service=WCS&version=1.0.0&request=GetCapabilities External Link

NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um NCSS

NTGS Pedirka Gravity 202381 Spherical Cap Bouguer Anomaly SCBA267um OPeNDAP