Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data 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 GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic is a first vertical derivative of the Total Magnetic Intensity grid for the Southern Bowen Basin, Qld, 2004. This grid has a cell size of 0.001 degrees (approximately 106m). The grid has units of nanoTesla per km (or nT/km). The data used to produce the TMI grid was acquired in 2004 by the QLD Government, and consisted of 74554 line-kilometres of data at 400m line spacing and 80m terrain clearance. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.
Product Type
dataset
eCat Id
143302
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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- QLD
- ( Project )
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- survey 1072
- ( Theme )
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- GADDS2.0
- ( Theme )
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- magnetics
- ( Theme )
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- first vertical derivative
- ( Theme )
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- magnetism
- ( Theme )
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- palaeomagnetism
- ( Theme )
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- airborne digital data
- ( Theme )
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- geophysical survey
- ( Theme )
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- mag
- ( Theme )
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- 1vd
- ( 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 GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic is a first vertical derivative grid of the Total Magnetic Intensity (TMI) anomaly for the Southern Bowen Basin, Qld, 2004. The survey was acquired under the project No. 1072 for the geological survey of QLD. A total of 74554 line-kilometres of data at a line spacing of 400m and 80m terrain clearance were acquired to produce the TMI grid. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the Total Magnetic Intensity grid of the Southern Bowen Basin, Qld, 2004 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. The grid has a cell size of 0.001 degrees (approximately 106m). The grid has units of nanoTesla per km (or nT/km). The first vertical derivative grid is very helpful for the enhancement of near surface features and structural features such as faults and dykes. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134. References: Intrepid Geophysics, http://www.intrepid-geophysics.com; Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - c6b58f54-102c-19e9-e044-00144fdd4fa6,
eCat ID - 74512
Extents
[-24.8923, -23.6473, 147.6635, 150.1905]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Association Type - operatedOnBy
GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic NCSS
Association Type - operatedOnBy
GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic OPeNDAP
Association Type - operatedOnBy
GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic WMS
Association Type - operatedOnBy
Downloads and Links
File available for download in various formats from the GADDS2 portal
GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic file download
GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic NCSS
GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic OPeNDAP
Source Information
This GSQ Southern Bowen Basin Qld magnetic vd1 grid geodetic includes airborne-derived TMI data for the Southern Bowen Basin, Qld, 2004 acquired for the geological survey of QLD