National Gravity Compilation 2019: Australian Elevation Grid

The National Gravity Compilation 2019 Ausdrape elevation ellipsoid grid records terrain heights relative to the GRS80 ellipsoid. The grid has a cell size of 0.00417 degrees (approximately 435m) and integrates ground, airborne, and marine data vertically continued to a drape surface. Australian Ocean Data Network published this data, last updated in May 2026.

Use Cases

• Calculate terrain corrections for gravity surveys based on the drape surface elevation.
• Model topographic effects on geophysical measurements based on the SRTM-derived ground surface.
• Generate smoothed elevation surfaces for airborne survey planning based on the specified climb/descent rates.
• Integrate multi-source elevation data for continental-scale geospatial analysis based on the national compilation.

Strengths

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

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; last updated date is 2026-05-05.

Provenance

Source

Australian Ocean Data Network

Collection Method

Processed from SRTM surface elevation 3 second grid data with a drape surface overlain.

Freshness

Last updated 2026-05-05.

Geography

Australia