IN2015_C01 Great Australian Bight Bathymetry 10m - 210m Multi-resolution AusSeabed products

Brief description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2015_C01 titled "GAB deep water geological and benthic ecology program". The voyage took place between October 22 to November 28, 2015, departing from Hobart (TAS) and arriving in Port Lincoln (SA). A short sea trial voyage (October 22 - 25, Hobart - Hobart) was undertaken prior to the charter which is included in this layer group.

The purpose of the voyage was to explore the deep-water geology and benthic biological communities on the primary Ceduna sedimentary sub-basin in the Great Australian Bight, which before this survey had been largely unstudied.

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 Great Australian Bight, 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 8.1.8. Once the raw files were converted into the HIPS and SIPS format the data was analysed for noise. Zero tide was applied, the lines were merged using the vessel file chosen upon conversion and TPU was calculated. 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.