National Gravity Compilation 2019: Airborne DGIR Tilt Image of Australia

Australia and its continental margins are covered by a gravity anomaly grid with a cell size of approximately 435 meters. The compilation integrates nearly 1.4 million ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry data collected from the 1940s to 2019. Geoscience Australia processed the data to produce a de-trended global isostatic residual (DGIR) tilt image for geological edge detection.

Use Cases

• Detecting edges of geological units based on the DGIR tilt filter.
• Mapping subsurface density variations based on gravity anomaly data.
• Integrating ground and airborne gravity surveys for regional geological models.
• Calibrating or validating other geophysical datasets using the processed gravity grid.

Strengths

• Integrates a large volume of observations, including nearly 1.4 million ground stations and over 450,000 line km of airborne data.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines multiple data sources, including ground observations, offshore global grids, and airborne surveys for improved resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The description metadata is limited; actual data quality and structure require manual inspection after download.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, integrating ground observations, offshore global gravity data, and airborne surveys.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-30 15:26:27.294666; freshness should be verified.

Geography

Australia and its continental margins