TAN2021_V01 Macquarie Ridge Complex 5m - 210m Multi-resolution AusSeabed products

• Format: Dataset
• Language: unknown
• Published: Commonwealth Scientific and Industrial Research Organisation
• Subjects: AusSeabed; MNF; CSIRO; NIWA; Marine geoscience; Geology; EARTH SCIENCES; Surveying (incl. hydrographic surveying); Geomatic engineering; ENGINEERING; Macquarie Island
• Online Access: https://doi.org/10.25919/kn3g-x440; https://researchdata.edu.au/tan2021v01-macquarie-ridge-ausseabed-products/2306604; https://data.csiro.au/collection/csiro:57356; http://hdl.handle.net/102.100.100/480998?index=1

This layer group describes multibeam echosounder data collected on RV Tangaroa TAN2021_V01 titled "NIWA TAN2113", which was carried out on a contract to the CSIRO MNF. The voyage took place between November 9 and December 4, 2021 departing from Wellington (NZ) and arriving in Wellington (NZ).\n\nThe purpose of the voyage was to recover Ocean-bottom seismometers deployed by the RV Investigator in 2020 (IN2020_V06) and acquire MBES and SBP data in the Macquarie Island region.\n\nThis dataset is published with the permission of CSIRO. Not to be used for navigational purposes.\n\nThe dataset contains bathymetry grids of 5m to 210m resolution of the Macquarie Island Ridge Complex, produced from the processed EM302 and EM2040 bathymetry data.\n\n\nLineage: Raw data (*.all files) from the EM302 and EM2040 were processed using QPS Qimera v2.4.2 for\nbathymetry and QPS GeoCoder Toolbox (FMGT) v7.10.0 for acoustic seafloor backscatter.\nQimera generates *.qpd files from all survey *.all files, which include all edits made to the raw files.\nThe quality of bathymetry data was examined, and surfaces of varying resolution generated for each\nsurvey area. The data were cleaned in both 2D and 3D manually, removing erroneous pings, gross\nerrors, and obvious noise. For areas of consistently flat seafloor, a Medium Spline filter was used to\nautomatically remove erroneous pings. These areas were checked by the multibeam operators to\nensure no misclassification of good pings.\nGridded bathymetric surfaces were projected in WGS84 / UTM zone 57S (EPSG:32757) coordinate\nreference system at varying resolutions during the voyage to aid further line planning and survey\npriorities. Bathymetry datasets were collated, and maps produced in ArcGIS Pro v2.8.3.\nBoth MBES systems also record the acoustic returns of mid-water reflectors. Water column data\nfrom both EM302 and EM2040 systems were logged (as *.wcd files). These files were not processed\non-board.\nThe raw files were analysed for noise and cleaned manually. The data was ...