Bluefin BF2022_V01 EM2040c Multibeam Echosounder Data

Brief description

This record describes multibeam echosounder data collected on voyage BF2022_V01 aboard the AMC's vessel the Bluefin. The vessel departed Beauty Point on the 28/02/2022 and returned to Beauty Point on the 21/03/2022.

The Kongsberg EM2040c multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter. The surveyed areas include Zeehan Marine Park, west of King Island and the Franklin Marine Park, west of Marrawah (NW Tasmania). A total surveyed area was 1026.2 km² not (including transits) comprising Zeehan Marine Park 726 km² and Franklin Marine Park 300.2 km².

The EM2040c provides a 1.3 degree by 1.3 degree angular resolution. The echosounder's nominal frequency is 300 kHz and it operated in dual swath mode.

Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. Raw data files include:

- 751 *.all files totalling 237GB
- 728 *.wcd files totalling 1.55TB

Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.all format are corrected for motion and position.

Processed data was corrected to MSL utilising the EGM2008 geoid model. Processed data had outliers removed. Processed line data are available in *.gsf format, and processed bathymetry and backscatter grids in geotiff format.

Additional information regarding this dataset, including information on processing streams, is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

Lineage

Maintenance and Update Frequency: asNeeded

Statement: Original field data. Processed data are SV corrected and tide corrected (GNSS ht and EGM2008 geoid model) and edited using Qimera v2.4.8. Additional data cleaning in Caris HIPS and SIPS 11.4.