National Gravity Compilation 2019: Australian Elevation Geoid Grid

A 2019 elevation geoid grid for Australia with a cell size of approximately 435 meters. The data were processed from SRTM surface elevation and other sources, vertically continued to a drape surface with a minimum clearance of 250 meters. It was produced by Geoscience Australia Data as part of the 2019 Australian National Gravity Grids B series.

Use Cases

• Modeling the geoid for geodetic height corrections based on the described drape surface.
• Integrating ground, airborne, and marine gravity data based on the described vertical continuation process.
• Creating smooth topographic surfaces for geophysical surveys based on the specified climb/descent rates and clearance.

Strengths

• Grid cell size is specified as 0.00417 degrees (approximately 435m).
• Data integrates multiple sources: ground, airborne, and marine-derived from satellite altimetry.
• Processing parameters are specified, including a minimum surface clearance of 250m and climb/descent rates of 25m 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 as the last metadata update is dated 2026-04-30.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from SRTM 3-second grid data and other sources, vertically continued to a defined drape surface.

Time Range

2019

Freshness

Last updated 2026-04-30 14:22:00.880995; freshness should be verified

Geography

Australia