Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line km of airborne surveys, were used to generate this grid. The data, compiled by Geoscience Australia and other government, industry, and research bodies, spans from the 1940s to 2019. It provides a processed tilt image of de-trended global isostatic residual anomalies for geological analysis.
Use Cases
- Detecting edges of geological units based on the tilt filter applied to DGIR anomalies.
- Mapping subsurface density variations based on processed gravity measurements.
- Improving geological resolution in areas with poor ground data based on integrated airborne gravity and gradiometry.
- Analyzing continental-scale geological structure based on the national gravity compilation.
Strengths
- Integrates approximately 1.8 million observations from multiple sources, including ground, airborne, and offshore data.
- Grid has a cell size of 0.00417 degrees (approximately 435m), providing a detailed spatial resolution.
- Data quality was checked by GA geophysicists to ensure fitness for purpose.
- Combines historical data from the 1940s with modern surveys for comprehensive temporal coverage.
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/source bias inherent to data_gov_au.
Provenance
- Source
- Australian Ocean Data Network, Geoscience Australia, Commonwealth, State and Territory Governments, mining industry, universities.
- Collection Method
- Processed from ground observations in the Australian National Gravity Database, offshore global gravity grids, and airborne surveys.
- Time Range
- 1940s to 2019
- Freshness
- Last updated 2026-04-16 16:16:01.791498; freshness should be verified.
- Geography
- Australia and its continental margins