National Gravity Compilation 2019: Australian Subsurface Gravity Anomaly Grid

A spherical cap Bouguer anomaly grid for the 2019 Australian National Gravity Grids series, derived from nearly 1.4 million ground stations and offshore data. The grid has a cell size of 0.00417 degrees (approximately 435m) and data are provided in gravity units (um/s^2). This compilation was processed and quality-checked by Geoscience Australia geophysicists using data current as of September 2019.

Use Cases

• Modeling subsurface geological structures based on Bouguer gravity anomaly data.
• Resource exploration targeting by interpreting density variations in the Earth's crust.
• Integrating with other geophysical datasets for regional geological studies based on the described grid resolution and coverage.

Strengths

• Derived from nearly 1.4 million quality-controlled gravity stations from the Australian National Gravity Database.
• Grid cell size of 0.00417 degrees (approximately 435m) provides a specific spatial resolution.
• Incorporates offshore data from a v28.1 global gravity grid sourced from Scripps, NOAA, and NGA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-04-20 02:07:00.676599; freshness should be verified.

Provenance

Source

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

Collection Method

Ground gravity observations processed via standard methods and supplemented with offshore satellite-derived data.

Time Range

Data current as of September 2019.

Freshness

Data reflects observations as of September 2019, with metadata updated in April 2026.

Geography

Australia and surrounding offshore regions.