A Web-Based Utility to Estimate Depth to Magnetisation from TMI Flightline Data

Geoscience Australia and CSIRO developed a pilot web utility for live depth estimation of magnetic anomalies. The tool inverts Total Magnetic Intensity flightline data from the Geophysical Archive Data Delivery System using horizontal-top tabular models. Presented at the 2025 Australasian Exploration Geoscience Conference, the utility allows users to select anomalies and iteratively invert models.

Use Cases

• Estimate depth to magnetic sources based on Total Magnetic Intensity flightline data.
• Perform iterative model inversion for subsurface structures based on user-selected 'sweet-spot' anomalies.
• Analyze geophysical data without the smoothing effects associated with gridding.
• Download inverted magnetic models for further geological interpretation.

Strengths

• Developed by Geoscience Australia and CSIRO, indicating authoritative provenance.
• Uses raw flightline data to avoid smoothing artifacts from gridding.
• Allows interactive, iterative model inversion with user control over parameters.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia Data

Collection Method

Inversion of Geophysical Archive Data Delivery System (GADDS) data.

Freshness

Last updated 2026-05-31 01:21:47.148507; freshness should be verified.