Gravity and Magnetic Grids for Northern Australia with Satellite and Survey Data

Geoscience Australia generated stitched gravity and magnetic grids covering three regions of Northern Australia. The dataset includes Free-air, Bouguer, and Total Magnetic Intensity anomalies derived from satellite data, ground surveys, and airborne and shipborne measurements. Processing used Geosoft Oasis montaj software, integrating data from sources like the Scripps Institution of Oceanography and the Geophysical Archive Data Delivery System.

Use Cases

• First-pass geological interpretation based on free-air gravity anomaly data.
• Modeling deep and shallow magnetic sources based on Total Magnetic Intensity and Reduction to the Pole grids.
• Filling offshore data gaps for gravity studies using the derived Satellite Bouguer gravity grid.
• Analyzing crustal composition and structure based on stitched onshore-offshore Bouguer gravity anomalies.

Strengths

• Covers three defined geographic regions in Northern Australia with specific latitude and longitude bounds.
• Integrates multiple data sources including satellite data from SIO/NOAA/NGA and ground/airborne surveys from Geoscience Australia.
• Includes standard processed datasets for geological analysis like Bouguer gravity, Free-air gravity, TMI, and RTP grids.

Limitations

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

Provenance

Source

Geoscience Australia, Scripps Institution of Oceanography (SIO), National Oceanic and Atmospheric Administration (NOAA), U.S. Navy, National Geospatial-Intelligence Agency (NGA).

Collection Method

Data downloaded from GADDS and SIO websites, processed and stitched using 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 2026-06-05 05:49:00.212629; freshness should be verified.

Geography

Northern Australia, specifically regions within 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).