IN2022_T01 Cairns to Darwin Transit Bathymetry 10m - 210m Multi-resolution AusSeabed products

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2022_T01 titled "Transit: Cairns to Darwin 2022". The voyage took place between September 11 and September 17, 2022, departing from Cairns (QLD) and arriving in Darwin (NT).\n\nThe purpose of this voyage was movement of RV Investigator from Cairns to Darwin in preparation for IN2022_V08.\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 Cairns to Darwin Transit produced from the processed EM122 and EM710 bathymetry data.\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 11.4.13. Data were imported into the HIPS project using EM Height and the vessel file appropriate for either the EM122 or EM710. EM710 data was logged with Seapath as the primary sensor for navigation and motion for the first portion of the voyage. For EM710 lines 000 to 010, GPS heights were not reliable for vertical weighting so predicted tides to MSL (provided by Rob Beaman) were applied as specified in the multibeam processing log (in2022_t01_MBES_processing_log.xlsx). For all other lines (EM710 and EM122) GPS tide was computed and applied using the EGM2008 model EGM_2008_1Min_Aust_WGS84.csar. TPU values were computed using Measured Sound Velocity = 0.3 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.