5028 Block 4 (Northeast) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RT

415,090 line-kilometres of magnetic data were acquired in 2024 for the Narryer survey in Western Australia. Geoscience Australia processed this grid to a 20m cell size, applying reduction to pole and a first vertical derivative to highlight subsurface features. The resulting grid, in units of nT per metre, is intended for geological interpretation.

Use Cases

• Map subsurface geological structures based on magnetic susceptibility contrasts.
• Locate structural features like dykes based on the processed magnetic anomaly grid.
• Interpret the geological history of a region based on the magnetic response of rock-forming minerals.

Strengths

• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Processing used a differential reduction to pole calculation up to a 5th order polynomial.
• Survey acquired 415,090 line-kilometres of data at 100m line spacing and 50m terrain clearance.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and total file size are unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia Data

Collection Method

Airborne magnetic survey acquired by the WA Government, processed with INTREPID Geophysics software.

Time Range

2024

Freshness

Last updated 2026-05-14 08:52:52.844897; freshness should be verified.

Geography

Narryer survey area, Western Australia (Block 4, Northeast).