IN2023_E01 Perth Basin Bathymetry 10m - 210m Multi-resolution AusSeabed products

Full description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2023_E01 titled "Sea Trials & Calibration". The voyage took place between January 7 and January 12, 2023, departing from Fremantle (WA) and arriving in Fremantle (WA).

The purpose of this voyage was to carry out annual calibrations and maintenance on acoustic systems and peripherals.

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

The dataset contains bathymetry grids of 10m to 210m resolution of the Perth Basin 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 11.4.7. Data were imported into the
HIPS project using EM Height and the vessel file appropriate for either the EM122 or EM710. GPS
tide was computed using the EGM2008 model; EGM_2008_1Min_Aust_WGS84.csar. TPU values
were computed using Measured Sound Velocity = 0.5 and Surface Sound Velocity = 0.2. 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.

During the patch test, angular offsets in SIS were zeroed then re-entered upon completion of the
patch test. Both Caris vessel files (EM122 and EM710) were modified to reflect these changes.

The 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.