Western Australia Magnetic Intensity Grid at 0.0025 Degree Resolution

Total magnetic intensity (TMI) data measures variations in the Earth's magnetic field caused by rock-forming minerals. This geodetic grid for Western Australia has a cell size of 0.0025 degrees (approximately 266m) with units in nanoTesla (nT). The data was acquired in 2005 by the WA Government and processed by GA geophysicists.

Use Cases

• Modeling subsurface geological structure based on magnetic anomaly data.
• Mapping rock type distributions based on magnetic susceptibility contrasts.
• Supporting mineral and resource exploration in Western Australia based on processed magnetic intensity.
• Calibrating regional geophysical models using quality-checked, fit-for-purpose grid data.

Strengths

• Data processed via standard methods to isolate the magnetic response of subsurface rocks.
• Final data quality-checked by GA geophysicists to ensure it is fit-for-purpose.
• Grid has a defined spatial resolution of 0.0025 degrees (approximately 266m).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The description states the original survey consisted of 'None line-kilometres' and 'Nonem' line spacing, indicating key acquisition metrics are missing.
• Row count is unknown, which may limit suitability assessment for large-scale modeling.

Provenance

Source

Australian Ocean Data Network via data_gov_au.

Collection Method

Data acquired in 2005 by the WA Government, processed and quality-checked by GA (Geoscience Australia) geophysicists.

Time Range

Acquisition year: 2005.

Freshness

Last updated 2026-04-10 16:47:58.620812; freshness should be verified.

Geography

Western Australia, onshore plus marine areas.