National Gravity Compilation 2019 DGIR: Gravity Anomaly Image of Australia

Geoscience Australia Data produced the National Gravity Compilation 2019 DGIR image from the 2019 Australian National Gravity Grids A series. The image shows de-trended global isostatic residual gravity anomalies over Australia and its continental margins, derived from nearly 1.4 million gravity stations and marine data. The underlying ground observations were collected by various government, industry, and research entities from the 1940s to 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly patterns.
• Detect mineral or resource deposits based on density variations in the Earth's crust.
• Integrate gravity data with other geophysical datasets for regional geological interpretation.
• Train machine learning models for geospatial anomaly detection on gravity grids.

Strengths

• Derived from nearly 1.4 million gravity stations, indicating a substantial observational base.
• Grid has a cell size of approximately 435 meters, suggesting a relatively high spatial resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates data from multiple sources, including government, industry, and global marine grids.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing for ground observations varies from 11 km to less than 1 km, indicating non-uniform data density.
• Row count and file size are unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from ground observations in the Australian National Gravity Database and offshore data from the Scripps Institution of Oceanography's Global Gravity grid.

Time Range

Ground data collected from the 1940s to 2019; compilation date is 2019.

Freshness

Last updated 2026-03-25 18:16:53.821002; freshness should be verified.

Geography

Australia and its continental margins.