Multibeam Sonar Backscatter Survey of Middleton and Elizabeth Reefs

January-February 2020 multibeam sonar backscatter data for Middleton Reef and Elizabeth Reef within the Lord Howe Marine Park. Geoscience Australia collected the data aboard the TV Bluefin as part of a National Environmental Science Program project. The survey provides baseline benthic habitat information for the marine park's 10-year management plan (2018-2028).

Use Cases

• Classify benthic habitat types using backscatter intensity values from the 4-meter resolution grids.
• Analyze seabed texture and composition by correlating backscatter data with collected sediment grab samples.
• Establish baseline maps for monitoring change by comparing backscatter grids from this survey with future repeat surveys.
• Integrate backscatter layers with concurrent AUV imagery and BRUV footage for multi-modal seafloor characterization.

Strengths

• Data collected with a high-resolution Kongsberg EM 2040C HD (300 kHz) multibeam sonar system.
• Provides 4-meter spatial resolution grids for detailed seabed analysis.
• Supports a defined 10-year marine park management plan (2018-2028).

Limitations

• Unknown total data volume, row count, and specific file sizes within the ZIP archive.
• Temporal coverage is limited to a single 7-day survey period in early 2020.
• Data is explicitly not for navigational purposes, limiting certain applications.

Provenance

Source

Geoscience Australia, published via the Australian Ocean Data Network.

Collection Method

Seabed mapping via ship-based multibeam sonar, supplemented by AUV imagery, sediment grabs, and BRUVs.

Time Range

31 January to 6 February 2020.

Freshness

null

Geography

Middleton Reef and Elizabeth Reef, Lord Howe Marine Park, Australia.