IN2024_V01 Southern Ocean Bathymetry 10m - 210m Multi-resolution AusSeabed products

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2024_V01 titled "Multidisciplinary Investigations of the Southern Ocean (MISO): Linking physics, biogeochemistry, plankton, aerosols, clouds and climate". The voyage took place between January 5 and March 5, 2024, departing from Hobart (TAS) and arriving in Fremantle (WA).\n\nThe purpose of the voyage was: \n1. To collect integrated physical, biogeochemical, and biological observations of the coupled Southern Ocean – atmosphere system needed to address gaps in scientific understanding of key processes and to understand reasons for biases in Earth System Models (ESMs). \n2. To use enhanced process-level understanding and observations to test and improve earth system models and for calibration/validation of satellite measurements. \n\nThis dataset is published with the permission of CSIRO. Not to be used for navigational purposes.\n\nThe dataset contains bathymetry grids of 10m to 210m resolution of the Southern Ocean, produced from the processed EM122 and EM710 bathymetry data.\n\nLineage: Multibeam data was logged from the EM’s in Kongsberg’s proprietary *.all format and was converted to be processed within CARIS HIPS and SIPS version 11.4.30. Data were imported into the HIPS project using EM Height and the vessel file appropriate for either the EM122 or EM710. GPS tide was computed using the EGM2008 model EGM_2008_1Min_Aust_WGS84.csar. TPU values were computed using Measured Sound Velocity = 0.5 and Surface Sound Velocity = 0.2. The raw files were analysed for noise and cleaned manually. The data was then gridded at the highest resolution possible and further inspected for outliers.\n\nThe data was then gridded at multiple resolutions in python Caris batch script using a Depth filter Vs Resolution guideline derived from AusSeabed Multibeam guidelines v2 and further inspected for outliers. Final raster products are available in L3 folder of this collection. Final processed data were also exported per line as GSF and ASCII format and available in the L2 folder of this collection.