National Gravity Compilation 2019 DGIR Tilt Image of Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations, were used to generate this grid. The National Gravity Compilation 2019 DGIR tilt image is a processed geophysical grid showing edge-detected gravity anomalies over Australia and its margins, produced by Geoscience Australia. It combines ground data collected from the 1940s onward with offshore data from global sources, processed to a cell size of approximately 435 meters.

Use Cases

• Edge detection of geological units based on the tilt filter applied to gravity anomalies.
• Modeling subsurface density variations based on processed gravity data.
• Integrating continental and marine geophysical data for regional geological studies.
• Training machine learning models for geophysical feature recognition in image data.

Strengths

• Derived from approximately 1.8 million gravity observations, providing broad coverage.
• Integrates data from multiple sources (government, industry, academia) collected from the 1940s to present.
• Grid cell size of 0.00417 degrees (approximately 435m) offers a specific spatial resolution.
• Quality-checked by GA geophysicists to ensure fitness-for-purpose.

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/temporal/source bias inherent to the compilation method.

Provenance

Source

Geoscience Australia Data

Collection Method

Ground and marine gravity observations processed via standard methods and FFT-based tilt filtering.

Time Range

Data collected from the 1940s to September 2019.

Freshness

Last updated 2026-03-25 15:39:14.469961; freshness should be verified.

Geography

Australia and its continental margins.