Levelled Marine Geophysical Line Data for the Australian Region, 1970s Onward

Geoscience Australia's compilation of ship-track gravity, magnetic, and bathymetry data, levelled to reduce errors between surveys from the 1970s onward. The data is organized by survey in ASCII files with records spaced approximately every 150 meters, containing both original and levelled measurements. This levelling work was performed by Desmond FitzGerald & Associates and Ron Hackney between 1998 and 2011, with final review by Yvette Poudjom Djomani.

Use Cases

• Modeling seafloor geology and tectonic structures based on levelled gravity and magnetic anomalies.
• Creating continuous bathymetric surfaces for oceanographic studies based on integrated ship-track data.
• Developing data integration pipelines for multi-vintage survey data based on the described levelling process.
• Analyzing long-term changes in marine geophysical properties based on time-indexed data from the 1970s onward.

Strengths

• Data has been levelled to reduce errors between intersecting surveys of various vintages.
• Includes both original (unlevelled) and processed (levelled) data for each measurement.
• Compilation incorporates surveys from Geoscience Australia and other institutions since the 1970s.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The compilation does not include shot-indexed seismic reflection data.

Provenance

Source

Geoscience Australia's marine geophysical survey database 'Mardat', and surveys from other institutions.

Collection Method

Ship-track surveys, with data levelled for gridding.

Time Range

Surveys acquired since the 1970s.

Freshness

Last updated 2026-04-28 13:25:04.538608; freshness should be verified.

Geography

Australian marine region.