IN2016_E01 East Tasman Plateau Bathymetry 10m - 210m Multi-resolution AusSeabed products

Brief description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2016_E01 titled "East Tasman Plateau – key to unravelling the onset of the Antarctic Circumpolar Currents". The voyage took place between August 17 and August 22, 2016, departing from Hobart (TAS) and arriving in Hobart (TAS).

The purpose of this voyage was to dredge volcanic and sedimentary rocks to obtain new, rigorous age and paleo-depth constraints for the Cascade Seamount. Underway bathymetric data was be used to refine dredge targets. Sediment cores were collected across a depth transect to enable work investigating paleo-oceanographic conditions using proxies. High resolution swath bathymetry and sub-bottom profile data were used to see how far recent sediment flows extend from the Cascade Seamount.

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 Tasman Plateau, produced from the processed EM122 and EM710 bathymetry data.


Lineage: Multibeam data was logged from the EMs 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 either the EM122 or EM710. The data was then gridded at the highest resolution possible and further inspected for outliers.

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.