National Gravity Compilation 2019: DGIR 0.5VD Grid for Australia

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. Geoscience Australia produced this dataset, which represents the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its margins. The grid has a cell size of 0.00417 degrees (approximately 435m) and incorporates data collected from the 1940s to September 2019.

Use Cases

• Model subsurface geological structures based on density variations revealed by gravity anomalies.
• Enhance mineral exploration targeting by interpreting the high-resolution DGIR 0.5VD grid.
• Integrate with other geophysical data for regional crustal studies based on the continent-wide coverage.
• Calibrate or validate airborne gravity survey methodologies using the included 345,000 line km of data.

Strengths

• Integrates approximately 1.8 million observations from ground, airborne, and offshore sources.
• Provides high resolution with a grid cell size of approximately 435 meters.
• Combines data from multiple sources collected over a long temporal range, from the 1940s to 2019.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic and temporal bias inherent to the aggregation of historical surveys.

Provenance

Source

Geoscience Australia Data, incorporating the Australian National Gravity Database and global data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from ground and airborne gravity observations via standard methods, with a Fast Fourier Transform applied to a DGIR grid.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-04-20 01:53:02.964656; freshness should be verified.

Geography

Australia and its continental margins.