Australian National Gravity Grids Elevation Data with 435m Resolution

A digital elevation grid for Australia derived from processed SRTM surface elevation data. The grid has a cell size of 0.00417 degrees (approximately 435 meters) and vertically integrates ground, airborne, and marine data from satellite altimetry. It was generated for the 2019 Australian National Gravity Grids B series under project No. 202008.

Use Cases

• Modeling terrain height variations based on the processed SRTM surface elevation data.
• Creating a smooth airborne survey drape surface based on the described minimum clearance and climb rates.
• Analyzing gravity anomalies based on the elevation data integrated into the National Gravity Grids.
• Generating geoid models based on the elevation data given in meters.

Strengths

• The grid has a defined cell size of 0.00417 degrees (approximately 435 meters).
• Data integrates multiple sources: ground, airborne, and marine derived from satellite altimetry.
• The drape surface has specified parameters: a minimum clearance of 250 m and isotropic maximum climb/descent rates of 25 m per km.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Freshness should be verified; the last metadata update is 2026-05-05.

Provenance

Source

Australian Ocean Data Network

Collection Method

Processed from SRTM 3 second grid data and vertically continued from ground, airborne, and marine sources.

Freshness

Last updated 2026-05-05 02:09:02.461802

Geography

Australia