National Gravity Compilation 2019: Australian Elevation Grid for Gravity Data

A 2019 geospatial grid provides the observation surface elevation for Australian National Gravity Grids B series relative to the GRS80 ellipsoid. The data, processed from SRTM, airborne, marine, and ground sources, has a cell size of approximately 435 meters (0.00417 degrees). It was produced by Geoscience Australia for project No. 202008.

Use Cases

• Processing and correcting gravity survey data based on the described drape surface with defined clearance and climb rates.
• Geophysical modeling and interpretation based on elevation data vertically continued to a uniform surface.
• Creating derivative visualizations like hillshade images based on the provided HSI (Hillshade) format.
• Integrating elevation context with gravity anomaly maps for geological studies based on the national gravity grid series.

Strengths

• Data integrates multiple sources: ground (SRTM), airborne, and marine-derived satellite altimetry.
• Grid has a defined spatial resolution of approximately 435 meters (0.00417 degrees).
• Processing parameters are specified, including a minimum surface clearance of 250 meters and maximum climb/descent rates of 25 m/km.

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 bias inherent to data_gov_au, focusing solely on Australia.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from SRTM surface elevation 3 second grid data, with additional airborne and marine data vertically continued to a drape surface.

Time Range

2019

Freshness

Last updated 2026-04-30 13:14:02.735732; freshness should be verified.

Geography

Australia