IN2016_V01 Heard and Macdonald Islands Bathymetry 10m - 210m Multi-resolution AusSeabed products

• Format: Dataset
• Language: unknown
• Published: Commonwealth Scientific and Industrial Research Organisation
• Subjects: AusSeabed; MNF; CSIRO; Marine geoscience; Geology; EARTH SCIENCES; Surveying (incl. hydrographic surveying); Geomatic engineering; ENGINEERING; Heard Island
• Online Access: https://doi.org/10.25919/jw5f-ad35; https://researchdata.edu.au/in2016v01-heard-macdonald-ausseabed-products/2305755; https://data.csiro.au/collection/csiro:57687; http://hdl.handle.net/102.100.100/484638?index=1

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2016_V01 titled "HEOBI: Heard Earth-Ocean-Biosphere Interactions". The voyage took place between January 8 and February 27, 2016, departing from Fremantle (WA) and arriving in Hobart (TAS).\n\nContinuous mapping of the seafloor was carried out using the multibeam systems (EM122, EM710); multi-frequency split beam echosounders, (ME70 and EK60); sub bottom profiler (SPB 120); gravimeter and magnetometer to characterise bathymetry for the identification of geothermal activity on the Heard Island-McDonald Island platform (HIMP) and Kerguelen plateau. Detailed characterisation of the volcano fields involved sampling of hydrothermal fluids for geochemistry purposes, also the use of dredging to retrieve rocks and volcanic glass for further onboard investigation.\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 Kerguelen Plateau produced from the processed EM122 and EM710 bathymetry data.\n\nLineage: Data processing for the EM122 and EM710 data was performed using CARIS 8.1.8. Data from both systems were imported into a single CARIS project using Vessel files Investigator_EM710 and Investigator_EM122. A zero tide was applied to the data before merging. All lines were swath edited and then subedited.\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.\n