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. 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 Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete 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 Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 6172 gravity stations at 4000m spacing were acquired to produce this grid.
Product Type
dataset
eCat Id
143881
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 )
-
- 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 201582
- ( 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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- complete
- ( 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 NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete 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 complete spherical cap Bouguer gravity anomalies were calculated by applying terrain correction (Bullard C) to the spherical cap Bouguer anomaly point data of NTGS Victoria Basin Gravity Survey (P201582). 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 Victoria Basin Gravity Survey (P201582) 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.
Parent Information
Geophysical Data Collection - gravity
UUID - c6b58f54-102c-19e9-e044-00144fdd4fa6,
eCat ID - 74512
Extents
[-17.3759, -14.6055, 128.9511, 133.2134]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Association Type - operatedOnBy
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD NCSS
Association Type - operatedOnBy
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD OPeNDAP
Association Type - operatedOnBy
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD WMS
Association Type - operatedOnBy
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD WCS
Downloads and Links
File available for download in various formats from the GADDS2 portal
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD file download
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD NCSS
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD OPeNDAP
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD WMS
NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD WCS
Source Information
This NTGS Victoria Basin Gravity P201582 Complete Spherical Cap Bouguer Anomaly 267GU 1VD includes ground gravity data for the NTGS Victoria Basin Gravity Survey (P201582) acquired for the geological survey of NT