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. These line dataset from the Cobar-Nymagee Part 2, NSW, 1999 survey were acquired in 1999 by the NSW Government, and consisted of 31212 line-kilometres of data at 250m line spacing and 60m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.
Product Type
dataset
eCat Id
142136
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
- ( Discipline )
-
- Earth sciences
- ( Discipline )
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- geophysics
- ( Feature type )
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- line
- ( Place )
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- Australia
- ( Place )
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- NSW
- ( Project )
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- survey 742
- ( Theme )
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- AWAGS
- ( Theme )
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- GADDS2.0
- ( Theme )
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- magnetics
- ( Theme )
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- magnetism and palaeomagnetism
- ( Theme )
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- magnetic
- ( Theme )
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- airborne digital data
- ( Theme )
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- line
- ( Theme )
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- vector
- ( Theme )
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- geophysical survey
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- Published_External
Publication Date
2019-12-15T00:00:00
Creation Date
2019-12-15T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This Cobar-Nymagee Area J B, NSW, 1999 (P742), magnetic line data, AWAGS levelled is an airborne-derived magnetic line dataset for the Cobar-Nymagee Part 2, NSW, 1999 survey. The data was acquired under the project No. 742 for the geological survey of NSW. A total of 31212 line-kilometres of data at a line spacing of 250m and 60m terrain clearance were acquired during this survey. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data (Milligan et al., 2009). This survey data is essentially levelled to AWAGS. 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: Milligan, P.R., Minty, B.R.S., Richardson, M. & Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey accurate continental magnetic coverage. Preview, No. 138, p. 1-128, Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
Extents
[-33.0654, -32.6412, 145.9563, 147.0318]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
This Cobar-Nymagee Area J B, NSW, 1999 (P742), magnetic line data, AWAGS levelled includes airborne-derived magnetic data for the Cobar-Nymagee Part 2, NSW, 1999 survey acquired for the geological survey of NSW