The National Gravity Compilation 2019 (free air grid) is a processed gravity anomaly grid for Australia and its continental margins. It integrates nearly 1.4 million ground stations from the Australian National Gravity Database and offshore data from global sources, with station spacing ranging from 11 km to less than 1 km. The grid has a cell size of 0.00417 degrees (approximately 435m) and data values are in gravity units (um/s^2).
Use Cases
- Model subsurface geological structures based on density variations inferred from gravity anomalies.
- Support mineral and resource exploration by revealing sub-surface geological features.
- Integrate with other geophysical datasets for regional geological studies.
- Analyze continental margin geology using the offshore data sourced from global gravity grids.
Strengths
- Integrates nearly 1.4 million gravity stations from a national database.
- Station spacing varies from 11 km to less than 1 km, providing detailed coverage.
- Grid cell size is 0.00417 degrees (approximately 435m), offering high spatial resolution.
- Data quality is checked by GA geophysicists to ensure fitness for purpose.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
Provenance
- Source
- Australian Ocean Data Network, incorporating data from Commonwealth, State and Territory Governments, industry, universities, and global sources.
- Collection Method
- Ground observations processed via standard methods and supplemented with offshore data.
- Time Range
- Data acquired from the 1940s to September 2019.
- Freshness
- Last updated 2026-05-05 01:18:22.797345; freshness should be verified.
- Geography
- Australia and its continental margins.