National Gravity Compilation 2019: Airborne DGIR 1VD Grid for Australia

Geoscience Australia's National Gravity Compilation 2019 includes an airborne DGIR 1VD grid derived from approximately 1.8 million gravity observations. The grid combines ground data from the Australian National Gravity Database, offshore data from global sources, and airborne surveys totaling 451,000 line kilometers. It represents the first vertical derivative of de-trended global isostatic residual anomalies at a cell size of approximately 435 meters.

Use Cases

• Mapping subsurface geological structures based on gravity anomaly data.
• Enhancing resolution for mineral exploration in areas with poor ground data quality using airborne gravity and gradiometry.
• Analyzing continental margin geology based on the grid's coverage of Australia and its margins.
• Calibrating or validating geophysical models using the processed, quality-checked DGIR anomalies.

Strengths

• Integrates nearly 1.4 million ground stations with 451,000 line kilometers of airborne surveys.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Grid has a fine spatial resolution with a cell size of approximately 435 meters.
• Combines data from multiple sources (government, industry, academia) collected from the 1940s to present.

Limitations

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

Provenance

Source

Geoscience Australia Data

Collection Method

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

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-03 17:13:27.073649; freshness should be verified.

Geography

Australia and its continental margins.