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Sir Samuel magnetic grid geodetic

Created 16/10/2025

Updated 16/10/2025

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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 Sir Samuel magnetic grid geodetic has a cell size of 0.00083 degrees (approximately 87m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1993 by the WA Government, and consisted of 47075 line-kilometres of data at 400m line spacing and 100m terrain clearance.

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Additional Info

Field Value
Title Sir Samuel magnetic grid geodetic
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/edef1c88-7d70-416f-b694-9aec9a78e892
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 17/05/1993 - 13/07/1993
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        119.8747,
        -28.0487
      ],
      [
        121.5655,
        -28.0487
      ],
      [
        121.5655,
        -26.7888
      ],
      [
        119.8747,
        -26.7888
      ],
      [
        119.8747,
        -28.0487
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Sir Samuel magnetic grid geodetic". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/sir-samuel-magnetic-grid-geodetic