IN2021_E03 South-East Tasmania Bathymetry 5m - 210m Multi-resolution AusSeabed products

Brief description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2021_E03 titled "Equipment Calibrations and Trials #3". The voyage took place between November 30 and December 8, 2021 departing from Hobart (TAS) and arriving in Hobart (TAS).

The primary objective for this voyage was for the Marine National Facility (MNF) to calibrate and commission new, upgraded, and existing critical equipment (with sea trials and personnel training) onboard RV Investigator for use in upcoming voyages in the 2022 schedule and beyond.

This dataset is published with the permission of CSIRO. Not to be used for navigational purposes.

The dataset contains bathymetry grids of 5m to 210m resolution of South-East Tasmania, produced from the processed EM122 and EM710 bathymetry data.
Lineage: 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 11.4.2. Data were imported into the HIPS project using EM Height and the vessel file appropriate for either the EM122 or EM710. GPS tide was applied using the EGM2008 model EGM_2008_1Min_Aust_WGS84.csar. TPU values were computed using Measured Sound Velocity = 0.5 and Surface Sound Velocity= 0.1. The raw files were analysed for noise and cleaned both manually or using a trial of the new CARIS Admiralty GAMS automated noise filter. As on the previous voyage (in2021_e02), the GAMS filter was observed to be overly aggressive. Good data rejected by the GAMS filter were manually re-accepted. The data was 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.