National Gravity Compilation 2019 DGIR Tilt Image of Australia

The 2019 Australian National Gravity Grids A series, incorporating data from the 1940s to the present day, form the basis of this dataset. It contains nearly 1.4 million gravity stations from the Australian National Gravity Database and offshore sources, processed to produce a tilt-filtered image of de-trended global isostatic residual anomalies. The grid has a cell size of approximately 435 meters and was quality-checked by Geoscience Australia geophysicists.

Use Cases

• Detect edges of geological units based on the tilt filter ratio of vertical to horizontal derivatives.
• Interpret sub-surface geological structure based on processed gravity anomalies.
• Analyze continental margin geology based on gravity data coverage over Australia and its margins.
• Assess rock density variations beneath the Earth's surface based on measured gravity changes.

Strengths

• Nearly 1.4 million gravity stations were used to generate the grid.
• Station spacing varies from 11 km down to less than 1 km, with major parts of the continent having spacing between 2.5 and 7 km.
• The processed data was quality-checked by GA geophysicists.
• The grid has a cell size of 0.00417 degrees (approximately 435m).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to the collection from multiple sources over decades.

Provenance

Source

Australian Ocean Data Network

Collection Method

Ground observations from government, industry, and research organizations, supplemented by offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Time Range

1940s to present day (as of September 2019)

Freshness

Last updated 2026-05-05 04:56:51.225386; freshness should be verified.

Geography

Australia and its continental margins