National Gravity Compilation 2019: Australian Drape Elevation Grid

Geoscience Australia Data produced the National Gravity Compilation 2019 Ausdrape elevation ellipsoid grid. This grid provides the elevation of the observation surface for the 2019 Australian National Gravity Grids B series relative to the GRS80 ellipsoid, with a cell size of approximately 435 meters. Data from ground, airborne, and marine sources were vertically continued to this drape surface, which mimics a smooth airborne survey with a minimum clearance of 250 meters.

Use Cases

• Processing and correcting gravity survey data based on the described drape surface elevation.
• Modeling terrain effects on gravity measurements based on the SRTM-derived ground surface data.
• Creating consistent reference surfaces for airborne geophysical surveys based on the specified climb/descent rates and clearance.
• Integrating multi-source elevation data for geophysical compilations based on the vertical continuation of ground, airborne, and marine data.

Strengths

• Grid cell size is specified as 0.00417 degrees (approximately 435m), providing a defined spatial resolution.
• Surface generation parameters are detailed, including a minimum clearance of 250 m and maximum climb/descent rates of 25 m per km.
• Integrates multiple data sources (ground, airborne, marine) processed to a consistent surface.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale computational tasks.
• Freshness should be verified; the last update timestamp is 2026-04-30 14:16:56.985341.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from SRTM surface elevation 3 second grid data with a drape surface overlain; ground, airborne, and marine data were vertically continued to this surface.

Time Range

Compilation dated 2019.

Freshness

Last updated 2026-04-30 14:16:56.985341

Geography

Australia