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 processing integrated satellite, airborne, and shipborne surveys, resulting in stitched Bouguer gravity and Total Magnetic Intensity grids.

Use Cases

• First-pass geological interpretation based on free-air gravity anomaly data.
• Gravity modeling for subsurface structure analysis based on Bouguer gravity grids.
• Mapping magnetic basement and shallow magnetic sources based on Total Magnetic Intensity (TMI) and Reduction to the Pole (RTP) grids.
• Filling data gaps in offshore regions using derived satellite Bouguer gravity grids.

Strengths

• Covers three defined regions in Northern Australia with specific latitude/longitude bounds.
• Integrates multiple data sources including satellite, ground, airborne, and shipborne surveys.
• Includes standard processed datasets for geological analysis: TMI, RTP, Free-air, and Bouguer gravity anomalies.

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 generated only for the North-West Shield region, not the entire coverage area.

Provenance

Source

Geoscience Australia (GA), 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, processed with Geosoft Oasis montaj software.

Time Range

Satellite data releases referenced are from 2019 (Free-air v27.1 in March, Topography v19.1 in January).

Freshness

Last updated 2026-04-04 08:34:57.341910; freshness should be verified.

Geography

Northern Australia, specifically regions within latitudes 7–30⁰ S and longitudes 110–160⁰ E.