From Geoscience Australia
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Total Magnetic Intensity Grid of Australia 2019 - First Vertical Derivative (1VD)

Created 16/10/2025

Updated 16/10/2025

JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Total magnetic intensity (TMI) data measures variations in the intensity of the Earth 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 first vertical derivative (1VD) grid is derived from the 2019 Total magnetic Intensity (TMI) grid of Australia which has a grid cell size of ~3 seconds of arc (approximately 80 m). As the vertical derivative filter is essentially a high-pass filter, longer wavelengths are suppressed, and shorter wavelengths emphasized. The magnetic units of the data are in nT per metre.

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Additional Info

Field Value
Title Total Magnetic Intensity Grid of Australia 2019 - First Vertical Derivative (1VD)
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/b0ac7cdc-a41f-471d-9cfb-ec2b7f97fbbf
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.502532,
        -43.928981
      ],
      [
        154.662516,
        -43.928981
      ],
      [
        154.662516,
        -9.025662
      ],
      [
        112.502532,
        -9.025662
      ],
      [
        112.502532,
        -43.928981
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Total Magnetic Intensity Grid of Australia 2019 - First Vertical Derivative (1VD)". 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-grid-of-australia-2019-first-vertical-derivative-1vd