Elizabeth and Middleton Reef multibeam sonar backscatter survey (GA4848)
Maintenance and Update Frequency: asNeeded Statement: While AusSeabed aims to publish data to the level of adherence based on the requirements stated in the AusSeabed multibeam guidelines (version 1), we will also publish interim products (version 0) that are currently available, but have not yet be...
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| Language: | unknown |
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Geoscience Australia
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| Online Access: | https://researchdata.edu.au/elizabeth-middleton-reef-survey-ga4848/1668117 https://pid.geoscience.gov.au/dataset/ga/144416 |
| Summary: | Maintenance and Update Frequency: asNeeded Statement: While AusSeabed aims to publish data to the level of adherence based on the requirements stated in the AusSeabed multibeam guidelines (version 1), we will also publish interim products (version 0) that are currently available, but have not yet been standardised (version 1). Users should be aware that V1 products will always supersede V0 products. This is a V1 product for GA4848 Processing: 1. Multibeam data were collected using a Kongsberg EM2040C multibeam echosounder system, mounted in the moon pool of the MV Bluefin. Motion referencing and navigation data were collected with an Applanix Position and Orientation system and a C-Nav GPS system, respectively. Multibeam data were acquired using Kongsberg’s Seabed Information System (SIS) software. 2. These data were processed using the multibeam backscatter CMST-GA MB Process v15.04.04.0 (x64) toolbox software co-developed by the Centre for Marine Science and Technology (CMST) at Curtin University of Technology and GA (described in Gavrilov et al., 2005; Parnum and Gavrilov 2011). 3. The process involved removal of the system transmission loss, removal of the system model, calculation of the incidence angle, correction of the beam pattern, calculation of the angular backscatter response within a sliding window of 100 pings with a 50% overlap in a 1° bin, removal of the angular dependence, and restoration to the backscatter strength at an angle of 40°. The final processed backscatter data were then gridded to 1 m horizontal resolution and exported for display and analysis. In GA, further process was conducted by Justy Siwabessy to fine tune beam pattern correction. 4. The processed data was finally exported as grids in the optimum resolution the data can provide. Metadata: The multibeam bathymetry was acquired by the following survey: - Survey Name: Elizabeth and Middleton Reef Backscatter survey (GA4848) - Vessel Name: TV Bluefin - Institution: Geoscience Australia,Institute for Marine & Antarctic Studies ... |
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