Australian National Gravity Compilation Grid 2019

Nearly 1.4 million gravity stations from the Australian National Gravity Database were used to generate this spherical cap Bouguer anomaly grid. The grid has a cell size of 0.00417 degrees (approximately 435 meters) and presents data in units of micro-meters per second squared. Compiled by Geoscience Australia using ground observations as of September 2019 and supplemented with offshore data.

Use Cases

• Model subsurface rock density variations by interpreting the Bouguer anomaly grid values.
• Map geological structures and basin architecture using the gravity anomaly spatial patterns.
• Integrate the 0.00417-degree resolution grid with magnetic or seismic data for joint geophysical inversion.
• Calibrate regional gravity field models using the nearly 1.4 million ground station observations as control points.

Strengths

• Derived from nearly 1.4 million quality-checked gravity station observations.
• Provides continent-wide coverage for Australia with a consistent 435-meter grid resolution.
• Processed and checked by Geoscience Australia geophysicists for fitness-for-purpose.

Limitations

• Limited to data available as of September 2019, lacking more recent observations.
• Offshore data is sourced from a global grid (v28.1), which may have lower resolution than the terrestrial data.

Provenance

Source

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

Collection Method

Ground gravity observations processed via standard methods and gridded using spherical cap techniques.

Time Range

Snapshot as of September 2019.

Freshness

Data reflects observations up to September 2019, with metadata updated in April 2026.

Geography

Australia and surrounding offshore regions.