DGIR 0.5VD Grid: Gravity Anomalies Over Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by marine data, were used to generate this grid. The National Gravity Compilation 2019 DGIR 0.5VD grid shows the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins, with a cell size of approximately 435 meters. Ground data has been acquired by government, industry, and research organizations from the 1940s to the present day.

Use Cases

• Mapping subsurface geological structure based on gravity anomaly data.
• Mineral exploration targeting based on density variations in rocks.
• Geophysical modeling of continental margins using combined ground and marine data.
• Quality checking processed gravity data for regional geological surveys.
• Interpreting the half vertical derivative of de-trended global isostatic residual anomalies.

Strengths

• Derived from approximately 1.8 million gravity observations, with nearly 1.4 million stations used.
• Combines long-term data collection from the 1940s to present from multiple government, industry, and academic sources.
• Integrates ground observations with offshore data from a global gravity grid (Scripps v28.1).
• Processed and quality-checked by GA geophysicists to ensure data is fit-for-purpose.

Limitations

• Specific license information, column names, and exact dataset size are not provided in the available metadata.
• Station spacing for ground observations varies widely, from 11 km to less than 1 km, which may affect resolution consistency.
• The dataset's last update date is listed as 2026, which is a future date and suggests a potential metadata error.

Provenance

Source

Australian National Gravity Database (ANGD) and Global Gravity grid (Scripps Institution of Oceanography v28.1).

Collection Method

Ground and marine gravity observations processed into a geospatial grid.

Time Range

1940s to present (2019 compilation date).

Freshness

2026-04-16 16:18:05.596726

Geography

Australia and its continental margins.