Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
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 Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic is the first vertical derivative of the spheical cap Bouguer anomaly grid for the Southern Wiso Basin Gravity Survey, 2013 (P201380). This gravity survey was acquired under the project No. 201380 for the geological survey of NT. The grid has a cell size of 0.00743 degrees (approximately 800m). A total of 3859 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.
Product Type
dataset
eCat Id
143917
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Data centre )
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- NCI
- ( Discipline )
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- Earth sciences
- ( Discipline )
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- geophysics
- ( Feature type )
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- grid
- ( Place )
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- Australia
- ( Place )
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- NT
- ( Project )
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- survey 201380
- ( Theme )
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- GADDS2.0
- ( Theme )
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- gravity
- ( Theme )
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- spherical cap
- ( Theme )
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- Bouguer
- ( Theme )
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- 1VD
- ( Theme )
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- first vertical derivative
- ( Theme )
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- ground digital data
- ( Theme )
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- geophysical survey
- ( Theme )
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- grav
- ( Theme )
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- grid
- ( Theme )
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- raster
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- Published_External
Publication Date
2020-03-07T00:00:00
Creation Date
2020-03-07T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic is the first vertical derivative of the spherical cap Bouguer anomaly grid for the Southern Wiso Basin Gravity Survey, 2013 (P201380). This gravity survey was acquired under the project No. 201380 for the geological survey of NT. The grid has a cell size of 0.00743 degrees (approximately 800m). A total of 3859 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 Southern Wiso Basin Gravity Survey, 2013 (P201380) 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.
Parent Information
Geophysical Data Collection - gravity
UUID - c6b58f54-102c-19e9-e044-00144fdd4fa6,
eCat ID - 74512
Extents
[-21.2362, -18.6668, 130.4069, 134.2981]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Association Type - operatedOnBy
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic NCSS
Association Type - operatedOnBy
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic OPeNDAP
Association Type - operatedOnBy
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic WMS
Association Type - operatedOnBy
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic WCS
Downloads and Links
File available for download in various formats from the GADDS2 portal
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic file download
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic NCSS
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic OPeNDAP
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic WMS
Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic WCS
Source Information
This Southern Wiso Basin NT Gravity Spherical Cap Bouguer 1VD Grid Geodetic includes ground gravity point data for the Southern Wiso Basin Gravity Survey, 2013 (P201380) acquired for the geological survey of NT