RV Investigator Voyage IN2025_E01 EM124 Multibeam Echosounder Data

Updated: 2025-04-22

This record describes multibeam echosounder data collected on RV Investigator voyage IN2025_E01, Trials and calibrations, which departed Hobart on the 19th February 2025 and returned to Hobart on the 1st March, 2025. The Kongsberg EM124 multibeam echosounder was used to acquire seafloor bathymetry, seafloor backscatter and water column backscatter. The EM124 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz. Data are stored in *.kmall raw format for bathymetry and backscatter and *.kmwcd format for water column backscatter at CSIRO. There are 115 files totalling 7.41 GB of raw data and 115 files totalling 18.3 GB of water column data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.kmall format are corrected for motion and position. GPS tide was computed using the EGM2008 model and applied to the processed data. Processed data has had outliers removed. Additional information regarding this dataset, including further information on processing streams, is contained in the GSM data acquisition and processing report.