IN2019_T02 Brisbane to Darwin Transit Bathymetry 10m - 210m Multi-resolution AusSeabed products

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2019_T02 titled "Deep seascapes of the Great Barrier Reef: Uncovering submarine canyons and landslides". The voyage took place between October 4 and October 14, 2019, departing from Brisbane (QLD) and arriving in Darwin (NT).\n\nThe purpose of this voyage was to transit from Brisbane to Darwin and to map the seascapes of the Great Barrier Reef, uncovering submarine canyons and landslides. \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 Brisbane 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 10.3.1. Initial data conversion and processing was performed using the GSM python batch utility. GPS height was set to GGK and TPU was calculated using values of Measured Tide: 0.1 SV Measured: 0.1 and SV Surface: 0.5. Once the raw files were converted into the HIPS and SIPS format the data were analysed for noise. Zerotide was applied to most lines, and the lines were merged using the vessel file appropriate for either the EM122 or EM710. The data was then gridded at the highest resolution possible and further inspected for outliers. For the Wessel marine park survey, tide was applied using the file TwoIslandBay_8-15Oct19_MSL.tid, as specified in the processing log. In rare cases, refraction coefficients were applied to correct sound velocity errors, particularly within the Swain slide area.\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.