Tanami NS 1F - 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 Tanami NS 1F - TMI grid (AWAGS) has a cell size of 0.00018 degrees (approximately 20m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2018 by the NT Government, and consisted of 5323 line-kilometres of data at 100m 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

144862

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 )
  • NT
( Project )
  • survey 1312
( 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

2020-10-31T00:00:00

Creation Date

2020-10-31T00:00:00

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 Tanami NS 1F - TMI grid (AWAGS) is an airborne-derived Total Magnetic Intensity (TMI) grid for the NTGS Tanami NS 1F Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018 survey. The survey was acquired under the project No. 1312 for the geological survey of NT. The grid has a cell size of 0.00018 degrees (approximately 20m). The units are in nanoTesla (or nT). A total of 5323 line-kilometres of data at a line spacing of 100m 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

[-20.8132, -20.6112, 130.0324, 130.4382]

Reference System

GDA94 (EPSG:4283)

Spatial Resolution

Service Information

Associations

Association Type - operatedOnBy

Tanami NS 1F - TMI grid (AWAGS) NCSS    

Association Type - operatedOnBy

Tanami NS 1F - TMI grid (AWAGS) OPeNDAP    

Association Type - operatedOnBy

Tanami NS 1F - TMI grid (AWAGS) WMS    

Association Type - operatedOnBy

Tanami NS 1F - TMI grid (AWAGS) WCS    

Downloads and Links

File available for download in various formats from the GADDS2 portal  

Tanami NS 1F - TMI grid (AWAGS) file download  

Tanami NS 1F - TMI grid (AWAGS) NCSS  

Tanami NS 1F - TMI grid (AWAGS) OPeNDAP  

Tanami NS 1F - TMI grid (AWAGS) WMS  

Tanami NS 1F - TMI grid (AWAGS) WCS  

Source Information

This Tanami NS 1F - TMI grid (AWAGS) includes airborne-derived TMI data for the NTGS Tanami NS 1F Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018 survey acquired for the geological survey of NT