National Gravity Compilation 2019: DGIR 0.5VD Grid for Australia

Geoscience Australia's National Gravity Compilation 2019 includes a grid of de-trended global isostatic residual anomalies. The grid is derived from nearly 1.4 million ground stations and over 450,000 line kilometers of airborne surveys, with data collected from the 1940s to 2019. It provides a half vertical derivative (0.5VD) grid at a resolution of approximately 435 meters for Australia and its continental margins.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting by integrating airborne and ground gravity measurements.
• Study continental-scale tectonic features using the de-trended global isostatic residual (DGIR) grid.

Strengths

• Integrates approximately 1.8 million observations from ground, airborne gravity, and gravity gradiometry surveys.
• Grid resolution is approximately 435 meters (0.00417 degrees).
• Data quality is checked by GA geophysicists and described as fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic or temporal bias inherent to the aggregation of surveys from the 1940s onward.

Provenance

Source

Australian Ocean Data Network, aggregating data from Commonwealth, State, Territory Governments, industry, and research organizations.

Collection Method

Processed from ground observations, offshore global grids, and airborne surveys using standard geophysical methods and Fast Fourier Transform (FFT).

Time Range

1940s to 2019

Freshness

Last updated 2026-06-23 04:02:16.608494; freshness should be verified.

Geography

Australia and its continental margins