876ca77e-ccde-4f73-a4b2-86334f64383b urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-06-24T23:30:40 creation ISO 19115 2016 RV Investigator Voyage IN2017_C01 EM122 Multibeam Echosounder Data 876ca77e-ccde-4f73-a4b2-86334f64383b This record describes multibeam echosounder data collected on RV Investigator voyage IN2017_C01, 'GAB deep water geological and benthic ecology program' which departed Hobart on the 11 April 2017 and returned to Hobart on the 28 April 2017. The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter around the GAB. 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 645 files totalling 20.5 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 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. {"type": "Polygon", "coordinates": [[[129.0, -36.0], [138.0, -36.0], [138.0, -34.0], [129.0, -34.0], [129.0, -36.0]]]} 129.0 138.0 -36.0 -34.0 Geophysical Survey and Mapping website information for this data set documentDigital Geophysical Survey and Mapping website information for this data set and link to downloading data. HTML RV Investigator survey information documentDigital RV Investigator survey information including voyage plans and summaries HTML MNF home page documentDigital Marine National Facility home page HTML Geophysical Survey and Mapping acquisition report documentDigital Geophysical Survey and Mapping acquisition report HTML Unnamed resource documentDigital License Graphic PNG