Enhanced Gravity and Magnetic Grids for Northern Australia

Geoscience Australia generated a series of gravity and magnetic grids covering Northern Australia. The dataset includes derivative gravity grids for the North-West Shield, Northern Territory, and Queensland, and a magnetic grid for the North-West Shield. Data sources include ground, airborne, shipborne, and satellite surveys, processed into stitched Bouguer gravity and Total Magnetic Intensity grids.

Use Cases

• First-pass geological interpretation based on free-air gravity anomaly images.
• Gravity modeling based on the raw free-air gravity information.
• Analyzing magnetic basement structure and composition based on Total Magnetic Intensity (TMI) data.
• Identifying shallow magnetic sources like volcanics or intrusions using magnetic anomaly data.
• Filling offshore data gaps using the derived Satellite Bouguer gravity grid.

Strengths

• Integrates multiple data sources including satellite, ground, airborne, and shipborne surveys.
• Covers three defined regions of Northern Australia with specific latitude/longitude bounds.
• Includes standard processed datasets for geological analysis like Bouguer gravity, TMI, and Reduction to the Pole (RTP) grids.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and file size are unknown, which may limit suitability assessment.
• The magnetic dataset is only available for the North-West Shield region, not the entire coverage area.

Provenance

Source

Geoscience Australia, Scripps Institution of Oceanography (SIO), NOAA, U.S. Navy, NGA.

Collection Method

Data downloaded from the Geophysical Archive Data Delivery System (GADDS) and SIO Satellite Geodesy, then processed and stitched using Geosoft Oasis montaj software.

Time Range

Satellite data releases referenced are from 2019 (v27.1 and v19.1).

Freshness

Last updated 2026-04-20 00:54:56.336415; freshness should be verified.

Geography

Northern Australia, specifically the North-West Shield Western Australia (7–26° S, 110–130° E), Northern Territory (7–26° S, 125.5–141° E), and Queensland (7–30° S, 135–160° E).