National Gravity Compilation 2019: Airborne DGIR Tilt Image of Australia

2019 compilation of gravity data for Australia and its continental margins, integrating observations from the 1940s to the present. The dataset includes approximately 1.8 million gravity observations, combining nearly 1.4 million ground stations with 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry data. It is processed by Geoscience Australia (GA) from the 2019 Australian National Gravity Grids B series and includes a tilt-filtered image of de-trended global isostatic residual (DGIR) anomalies.

Use Cases

• Detect edges of geological units based on the tilt-filtered DGIR anomalies described.
• Model subsurface density structures based on gravity anomaly measurements.
• Improve geological mapping resolution in areas with sparse ground data using the included airborne gravity and gradiometry surveys.
• Analyze continental-scale isostatic compensation and crustal thickness variations from the processed DGIR grid.

Strengths

• Integrates a large volume of data, including approximately 1.8 million gravity observations.
• Combines multiple data sources: ground stations, airborne gravity (345,000 line km), and airborne gravity gradiometry (106,000 line km).
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides high-resolution coverage with a grid cell size of approximately 435 meters.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific modeling tasks.

Provenance

Source

Geoscience Australia (GA), Commonwealth, State and Territory Governments, mining industry, universities, and research organisations.

Collection Method

Data acquired from ground and airborne surveys, processed via standard methods and FFT filtering, and compiled into a national grid.

Time Range

1940s to 2019 (with database snapshot as of September 2019).

Freshness

Last updated 2026-04-10 22:02:29.500025; freshness should be verified.

Geography

Australia and its continental margins.