Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS)  


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 Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) has a cell size of 0.0004 degrees (approximately 41m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2019 by the SA Government, and consisted of 1660000 line-kilometres of data at 200m line spacing and 60m terrain clearance. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid.

Product Type

dataset

eCat Id

144820

Contact for the resource

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

theme.ANZRC Fields of Research.rdf
  • EARTH SCIENCES
( Data centre )
  • NCI
( Discipline )
  • Earth sciences
( Discipline )
  • geophysics
( Feature type )
  • grid
( Place )
  • Australia
( Place )
  • SA
( Project )
  • survey 5000
( Theme )
  • AWAGS
( Theme )
  • GADDS2.0
( Theme )
  • TMI
( Theme )
  • magnetics
( Theme )
  • magnetism
( Theme )
  • palaeomagnetism
( Theme )
  • airborne digital data
( Theme )
  • geophysical survey
( Theme )
  • mag
( Theme )
  • total magnetic intensity
( Theme )
  • grid
( Theme )
  • raster
  • Published_External

Publication Date

2020-11-03T00:00:00

Creation Date

2020-11-03T00:00:00

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

completed

Purpose

Maintenance Information

notPlanned

Topic Category

geoscientificInformation

Series Information

Lineage

This Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) is an airborne-derived Total Magnetic Intensity (TMI) grid for the Gawler Craton Airborne Survey Magnetic Radiometric and DEM Merge, SA, 2017-2019 survey. The survey was acquired under the project No. 5000 for the geological survey of SA. The grid has a cell size of 0.0004 degrees (approximately 41m). The units are in nanoTesla (or nT). A total of 1660000 line-kilometres of data at a line spacing of 200m and 60m terrain clearance were acquired to produce this grid. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid (Milligan et al., 2009). This survey grid 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. Reference: 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

[-32.6745, -27.3437, 130.9839, 138.0123]

Reference System

GDA94 (EPSG:4283)

Spatial Resolution

Service Information

Associations

Association Type - operatedOnBy

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) NCSS    

Association Type - operatedOnBy

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) OPeNDAP    

Association Type - operatedOnBy

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) WMS    

Association Type - operatedOnBy

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) WCS    

Downloads and Links

File available for download in various formats from the GADDS2 portal  

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) file download  

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) NCSS  

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) OPeNDAP  

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) WMS  

Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) WCS  

Source Information

This Gawler Craton Airborne Survey Merge Magnetics - TMI grid (AWAGS) includes airborne-derived TMI data for the Gawler Craton Airborne Survey Magnetic Radiometric and DEM Merge, SA, 2017-2019 survey acquired for the geological survey of SA