National Gravity Compilation 2019: De-trended Isostatic Residual Grid for Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line kilometers of airborne surveys, were used to generate this 2019 grid. The dataset, produced by Geoscience Australia, provides de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters. Data from ground observations, offshore global grids, and airborne surveys collected from the 1940s to 2019 were integrated to create this compilation.

Use Cases

• Modeling subsurface geological structures based on density variations revealed by gravity anomalies.
• Mineral and resource exploration targeting based on gravity anomaly patterns.
• Integrating gravity data with other geophysical datasets for regional geological studies.
• Calibrating and validating airborne gravity survey methodologies.

Strengths

• Integrates approximately 1.8 million observations from multiple sources (ground, airborne, offshore).
• Includes 451,000 line kilometers of airborne gravity and gravity gradiometry data to improve resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides continent-wide coverage of Australia and its margins at a consistent ~435m resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Ground station spacing varies from 11 km to less than 1 km, indicating uneven data density.

Provenance

Source

Geoscience Australia (GA), supplemented by data from the Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from the Australian National Gravity Database and global grids, with standard gravity data processing methods applied.

Time Range

Data acquired from the 1940s to 2019, compiled as of September 2019.

Freshness

Last updated 2026-04-10 20:20:21.287358; freshness should be verified.

Geography

Australia and its continental margins.