IN2017_V05 West Australia Coast Bathymetry 10m - 210m Multi-resolution AusSeabed products

Full description

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2017_V05 titled "Long-term recovery of trawled marine communities 25 years after the world’s largest adaptive management experiment". The voyage took place between October 11 and November 10, 2017, departing from Broome (WA) and arriving in Fremantle (WA).

The purpose of this voyage was to determine the extent to which habitat forming benthic and fish assemblages of the North West Shelf (NWS) have recovered from high levels of trawling between the 1960s and the late 1980s.

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 West Australia Coast 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 10.3. Once the raw files were converted into the HIPS and SIPS format the data was analysed for noise. GPS tides were calculated based on the Ausgeiod09 model. Data for zones 49J, 49K, 50J, 50K, and 51K were combined to cover the entire voyage area, although the majority of the voyage fell into zone 50K. GPS tide was smoothed using 120 second moving average window. The lines were merged using the vessel file appropriate for either the EM122 or EM710 with the smoothed GPS tide applied.

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.