Bluefin BF2020_V01 EM2040c Multibeam Echosounder Data

Brief description

This record describes multibeam echosounder data collected on voyage BF2020_v01 aboard the AMC's vessel the Bluefin. The vessel departed Beauty Point on the 11/08/2020 and returned to Beauty Point on the 17/08/2020. The Kongsberg EM2040c multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter. The survey area was ~4km to the south east of Golden Beach was ~6.2 km x ~15.4 km. (Area surveyed including turns totalled 103.7 km2). This survey area encompasses previously surveyed areas (2017 and 2018) and extended seaward to a depth of 26m. 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. This project also utilised a dual head arrangement enabling a greater swath coverage. Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. Raw data files include: - 545 *.all files totalling 195GB - 513 *.wcd files totalling 1.35TB 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 AHD utilising the AusGeoid2020 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 and edited using CARIS version 11.3