IN2018_V03 East Australian Current Bathymetry 10m - 210m Multi-resolution AusSeabed products

Brief description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2018_V03 titled "Integrated Marine Observing System: monitoring of East Australian Current property transports at 27oS.". The voyage took place between April 19 and May 10, 2018, departing from Brisbane (QLD) and arriving in Brisbane (QLD).

The purpose of this voyage was to recover and re-deploy an array of six full-depth velocity and property (temperature,
salinity and pressure) moorings from the continental slope to the abyssal waters off Brisbane (27°S). The GSM survey work was an opportunistic addition to the moorings work which was conducted in daylight hours. Every evening and night was used when practical to maps areas not previously surveyed from the RV Investigator two prior mooring voyages to this EAC site.

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 East Australian Current produced from the processed EM122 bathymetry data.
Lineage: EM122 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 9.1.2. Once the raw files were converted into the HIPS and SIPS format the data was analysed for noise. Zerotide was applied, and the lines were merged using the vessel file appropriate for the EM122. The data was then gridded at the highest resolution possible and further inspected for outliers.

The EM710 was turned off for the entire voyage as the priority was the best quality ADCP data with the least possible acoustic interference in the 75 Khz band.

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.