Enhanced Gravity and Magnetic Grids for Northern Australia

Geoscience Australia generated a series of gravity and magnetic grids covering Northern Australia. The data includes derivative gravity datasets for the North-West Shield, Northern Territory, and Queensland, and a magnetic dataset for the North-West Shield. It incorporates satellite data from Scripps Institution of Oceanography and processed survey data, with the last update recorded as 2026-04-30.

Use Cases

• Geological interpretation and mapping based on free-air and Bouguer gravity anomalies.
• Modeling subsurface structures based on Total Magnetic Intensity (TMI) and Reduction to the Pole (RTP) grids.
• Identifying magnetic sources like basement structures or intra-sedimentary units based on magnetic anomaly data.
• Filling offshore data gaps for regional studies using the derived satellite Bouguer gravity grid.

Strengths

• Covers three distinct regions of Northern Australia with specified 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 such as TMI, RTP, FA, 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 available only for the North-West Shield region, not the entire area of interest.

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 website, then processed and stitched using Geosoft Oasis montaj software.

Freshness

Last updated 2026-04-30 15:32:50.914987; 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).