RV Investigator Voyage IN2018_T02 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2018_T02, 'Harmful Algal Blooms and their long term sediment record in East Coast Tasmanian waters' which departed Brisbane on the 14th May 2018 and returned to Hobart on the 21st May 2018. The overall objective of this transit voyage was aimed at addressing the following research topics:1. Harmful Algal Blooms and their long term sediment record in East Coast Tasmanian waters; 2. Spatial and temporal variability in the distribution and abundance of seabirds and 3. Remote-ROAM: mobile modelling sea trials. The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information between Brisbane and Hobart.The EM122 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz.Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 161 files totaling 8.9 GB of raw data in this dataset.Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.all format are corrected for motion and position.Tide corrections were not applied to the processed data. Processed data had outliers removed. Processed line data are available in *.gsf and ascii 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.