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Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition Enhanced Products Package

Created 16/10/2025

Updated 16/10/2025

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Several products were produced from the Total Magnetic Intensity (TMI) Grid of Australia 2019, seventh edition (eCat ID 131505). The grid was found to include 3 extreme, high-amplitude cultural data spikes from current and historical aluminium smelters in Victoria and Tasmania. Also, 3 data spikes of unknown origin were located in the Hunter region of NSW. These 6 data spikes were removed from the gridded data. The following products were produced from the grid with the data spikes removed:

Total Magnetic Intensity (TMI) edited grid (.ers) Variable Reduction to Pole (VRTP) grid (.ers) First Vertical Derivative (1VD) grid (.ers) Half Vertical Derivative (05VD) grid (.ers) Pseudo-Gravity (PGrav) grid (.ers) Pseudo-Gravity, Total Horizontal Derivative (THD) grid (.ers) Susceptibility (Sus) grid (.ers) Variable Vertical Gradient (VBzz) grid (.ers) Analytic Signal (AS; Total Gradient) grid (.ers) Tilt Angle (Tilt; Phase Map) grid (.ers) Tilt Angle (Tilt; Phase Map), Total Horizontal Derivative (THD) grid (.ers) Upward Continuation (UC) Residual (Res) Filters (0 to 100 km; 12 grids) Mutliscale Edge Detection Polygons (for each MGA zone; .shp) Analytic Signal Phase Polygons (.shp) GeoTiff Images (of all grids; .tif)

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Additional Info

Field Value
Title Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition Enhanced Products Package
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/4fd121a7-d945-4433-92ab-4256603c9e2f
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 01/01/2019
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.0,
        -44.0
      ],
      [
        154.0,
        -44.0
      ],
      [
        154.0,
        -9.0
      ],
      [
        112.0,
        -9.0
      ],
      [
        112.0,
        -44.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Total Magnetic Intensity (TMI) Grid of Australia 2019 - seventh edition Enhanced Products Package". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/total-magnetic-intensity-tmi-grid-of-australia-2019-seventh-edition-enhanced-products-package