National Gravity Compilation 2019: Free Air Anomaly Grid for Australia

Australia's 2019 National Gravity Compilation provides a free air anomaly grid covering the continent and its continental margins. The grid integrates nearly 1.4 million ground stations from the Australian National Gravity Database, supplemented with offshore data from a global grid, and has a cell size of approximately 435 meters. This processed data reveals subsurface density variations for geological interpretation.

Use Cases

• Mapping geological structures based on subsurface density anomalies.
• Supporting mineral and hydrocarbon exploration by revealing basement architecture.
• Conducting geophysical research on crustal thickness and composition.
• Integrating gravity data with other geospatial layers for regional geological studies.

Strengths

• Integrates a large volume of observations, using nearly 1.4 million gravity stations from a database of approximately 1.8 million.
• Combines long-term data from multiple sources, including government, industry, and academia, collected from the 1940s onward.
• Provides detailed spatial coverage with a fine cell resolution of approximately 435 meters.

Limitations

• Specific column names and data structure are not provided in the source metadata.
• License information is not explicitly stated across the available sources.
• The dataset's size and row count are not documented.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and Scripps Institution of Oceanography.

Collection Method

Grid derived from ground observations in the Australian National Gravity Database (as of September 2019) and offshore data from the Global Gravity grid (v28.1).

Time Range

1940s to present (data collection), compiled as of September 2019.

Freshness

Last updated 2026-05-14

Geography

Australia and its continental margins.