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St George tmi grid geodetic

Created 17/10/2025

Updated 17/10/2025

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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 St George tmi grid geodetic has a cell size of 0.00021 degrees (approximately 22m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2001 by the QLD Government, and consisted of 61110 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

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Additional Info

Field Value
Title St George tmi grid geodetic
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/25e4a27a-6adb-41c7-938c-43a14618ea0c
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 26/04/2001 - 16/08/2001
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        147.7747,
        -28.8992
      ],
      [
        149.2492,
        -28.8992
      ],
      [
        149.2492,
        -27.6316
      ],
      [
        147.7747,
        -27.6316
      ],
      [
        147.7747,
        -28.8992
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "St George tmi grid geodetic". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/st-george-tmi-grid-geodetic