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 NTGS Tanami EW Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018 survey were acquired in 2018 by the NT Government, and consisted of 97969 line-kilometres of data at 200m 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
144843
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
-
- EARTH SCIENCES
- ( Discipline )
-
- Earth sciences
- ( Discipline )
-
- geophysics
- ( Feature type )
-
- line
- ( Place )
-
- Australia
- ( Place )
-
- NT
- ( Project )
-
- survey 1312
- ( Theme )
-
- AWAGS
- ( Theme )
-
- GADDS2.0
- ( Theme )
-
- magnetics
- ( Theme )
-
- magnetism and palaeomagnetism
- ( Theme )
-
- magnetic
- ( Theme )
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- airborne digital data
- ( Theme )
-
- line
- ( Theme )
-
- vector
- ( Theme )
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- geophysical survey
-
- Published_External
Publication Date
2020-11-03T00:00:00
Creation Date
2020-11-03T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This Tanami EW - magnetic line data (AWAGS) is an airborne-derived magnetic line dataset for the NTGS Tanami EW Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018 survey. The data was acquired under the project No. 1312 for the geological survey of NT. A total of 97969 line-kilometres of data at a line spacing of 200m 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
[-20.2328, -18.976, 128.989, 131.1741]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Downloads and Links
Source Information
This Tanami EW - magnetic line data (AWAGS) includes airborne-derived magnetic data for the NTGS Tanami EW Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018 survey acquired for the geological survey of NT