5028 Block 3 (Northwest) Grid: Total Magnetic Intensity with RTP and 1VD

Total magnetic intensity (TMI) data measures variations in the Earth's magnetic field caused by rock-forming minerals. This grid covers the Narryer survey area, processed with reduction to pole and first vertical derivative, with a cell size of approximately 20 meters. The data was acquired in 2024 by the WA Government, consisting of 415,090 line-kilometres of data.

Use Cases

• Interpret subsurface geological structure based on magnetic anomalies.
• Locate structural features such as dykes based on the magnetic response grid.
• Analyze rock susceptibility contrasts using the processed first vertical derivative grid.

Strengths

• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• The grid is derived from 415,090 line-kilometres of data acquired in 2024, indicating a substantial survey effort.
• Processing includes a variable reduction to the pole and a first vertical derivative, which are standard methods for enhancing interpretability.

Limitations

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

Provenance

Source

Geoscience Australia Data

Collection Method

Acquired via airborne survey by the WA Government, processed using INTREPID Geophysics software.

Time Range

2024

Freshness

Last updated 2026-05-14 03:09:11.243235

Geography

Narryer survey area, Northwest Australia (Block 3, 5028).