Australian Gravity Anomaly Grid 2019 with 435m Resolution

Australia and its continental margins are covered by a gravity anomaly grid with a cell size of 0.00417 degrees (approximately 435m). The grid integrates nearly 1.4 million ground stations and over 450,000 line km of airborne surveys, processed to show the first vertical derivative of de-trended global isostatic residual anomalies. It was compiled by Geoscience Australia using data from government, industry, and research sources dating from the 1940s to 2019.

Use Cases

• Map subsurface geological structures based on gravity anomaly patterns.
• Identify potential mineral exploration targets based on density contrasts in the crust.
• Integrate gravity data with other geophysical surveys for regional geological modeling.
• Calibrate or validate airborne gravity gradiometry survey results.

Strengths

• Integrates a massive data foundation of approximately 1.8 million gravity observations.
• Combines ground, airborne gravity, and airborne gravity gradiometry data for improved resolution.
• Grid cell size of approximately 435m provides a detailed spatial representation.
• Data has undergone quality checks by GA geophysicists to be fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic/temporal bias inherent to data_gov_au.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database (ANGD), Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Processed from ground observations, airborne surveys, and global gravity grids using standard geophysical methods and FFT.

Time Range

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

Freshness

Last updated 2026-04-10 18:06:15.467084; freshness should be verified.

Geography

Australia and its continental margins.