Enhanced Gravity and Magnetic Grids for Northern Australia

Geoscience Australia generated gravity and magnetic grids covering Northern Australia, including the North-West Shield, Northern Territory, and Queensland. The data integrates satellite-derived Free-air and Bouguer gravity anomalies from 2019 with ground and airborne survey data, processed using Geosoft Oasis montaj software. The resulting stitched grids include Total Magnetic Intensity (TMI) and Reduction to the Pole (RTP) enhancements.

Use Cases

• First-pass geological interpretation based on free-air gravity anomaly images.
• Gravity modeling for subsurface structure analysis using terrain-corrected Bouguer gravity data.
• Identifying magnetic sources from Total Magnetic Intensity (TMI) grids, including deep basement structures and shallow sedimentary units.
• Regional geological mapping using stitched onshore-offshore Bouguer gravity grids.

Strengths

• Data covers three defined regions in Northern Australia with specific latitude/longitude bounds.
• Integrates multiple data sources: satellite data from SIO/NOAA/NGA and ground/airborne surveys from Geoscience Australia.
• 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 dataset size are unknown, which may limit suitability assessment.
• The magnetic dataset is generated only for the North-West Shield Western Australia region, not the entire study area.

Provenance

Source

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

Collection Method

Data downloaded from GADDS and SIO websites, processed and stitched using Geosoft Oasis montaj software.

Time Range

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

Freshness

Last updated 2026-04-10 16:35:34.945944; freshness should be verified.

Geography

Northern Australia, specifically regions within latitudes 7-30° S and longitudes 110-160° E.