From Geoscience Australia
JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Ashton magnetic grid

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'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 Ashton magnetic grid has a cell size of 0.00083 degrees (approximately 91m). 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 51484 line-kilometres of data at 400m line spacing and 60m terrain clearance.

Files and APIs

Tags

Additional Info

Field Value
Title Ashton magnetic grid
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/8e6d5046-14d5-419d-8a1d-dfffae5bcd5e
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 01/11/1993 - 30/11/1993
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        125.98,
        -16.033
      ],
      [
        128.0191,
        -16.033
      ],
      [
        128.0191,
        -14.9688
      ],
      [
        125.98,
        -14.9688
      ],
      [
        125.98,
        -16.033
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

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