Australian National Gravity Anomaly Grid with 435m Resolution, 2019

The 2019 National Gravity Compilation tilt image is derived from nearly 1.4 million gravity stations in the Australian National Gravity Database as of September 2019, supplemented with offshore data. The grid has a cell size of 0.00417 degrees (approximately 435m) and covers Australia and its continental margins. Data was acquired from the 1940s to present by government, industry, and research entities, processed with terrain corrections and a tilt filter.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Support mineral and resource exploration based on density variations in rock.
• Integrate with other geophysical datasets for regional geological analysis based on the continental coverage.
• Apply terrain correction methods for gravity data processing based on the described use of bathymetry and topography.

Strengths

• Derived from nearly 1.4 million quality-checked gravity observations.
• Grid cell size of approximately 435m provides detailed spatial resolution.
• Data incorporates observations from the 1940s to present, offering historical depth.
• Processed with standard methods and checked by GA geophysicists for 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.
• Freshness should be verified; the underlying gravity database snapshot is from September 2019.

Provenance

Source

Australian National Gravity Database (ANGD) and Global Gravity grid from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and offshore gravity observations processed with terrain corrections and a tilt filter applied to a spherical cap Bouguer anomaly.

Time Range

1940s to 2019 (with database snapshot from September 2019).

Freshness

Last updated 2026-06-04 07:31:07.623296

Geography

Australia and its continental margins.