IN2021_V04 Indian Ocean Territories Bathymetry 10m - 210m Multi-resolution AusSeabed products

Brief description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2021_V04 titled "Biodiversity Assessment of Australia’s Indian Ocean Territories (IOT)". The voyage took place between June 30 and July 29, 2021, departing from Darwin (NT) and arriving in Hobart (TAS).

The purpose of this voyage was to characterise benthic biodiversity from seamounts (100-3500 m) across the EEZ in Australia’s Indian Ocean Territories (IOT) for the first time.

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 Indian Ocean Territories 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 11.3.8.

Following the initial data conversion into the HIPS and SIPS format, the data was analysed for noise. No tide was applied, and the soundings were reduced to the EGM2008 model using logged ellipsoid referenced heights in the raw data files. Lines were georeferenced using the vessel file appropriate for either the EM122 or EM710.

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.