Davis Multibeam Survey 2016/17, Antarctica (GA-0357/AAP 5093) - High Resolution Backscatter Grid

• Other Authors: Australia (originator), Australian Antarctic Data Centre (publisher), Australian Antarctic Division (originator), Australian Antarctic Divisionb (originator), Commonwealth of Australia (Geoscience Australia) (distributor), Commonwealth of Australia (Geoscience Australia) (pointOfContact), Environmental Geoscience Division (resourceProvider), HARRIS, URSULA (hasPrincipalInvestigator), Manager Client Services (pointOfContact), Parums, R. (pointOfContact), SIWABESSY, JUSTY (processor), SMITH, JODIE (hasPrincipalInvestigator), Siwabessy, J. (pointOfContact), Siwabessy, J. (author)
• Format: Dataset
• Language: unknown
• Published: Geoscience Australia
• Subjects: geoscientificInformation; EARTH SCIENCES; backscatter; antarctica; Published_External; Burton; Davis Station; Davis-Station; Kongsberg; Antarc*; Antarctica
• Online Access: https://researchdata.edu.au/davis-multibeam-survey-backscatter-grid/1426377; https://pid.geoscience.gov.au/dataset/ga/130644; https://doi.org/10.26186/5d5b56ea20858

Maintenance and Update Frequency: asNeeded Statement: This dataset was acquired using Kongsberg's SIS acquisition software and pre-processed onboard using CMST-GA MB Process v15.04.04.0 software by Kim Picard. Processing: 1. Multibeam data were collected using a Kongsberg EM2040C multibeam echosounder system, mounted in the moon pool of the Workboat Howard Burton. 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 25°. The final processed backscatter data were then gridded to 2 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 a grid in the optimum resolution the data can provide. Metadata: The multibeam bathymetry was acquired by the following survey: - Survey Name: Davis Station Marine Survey 2016 (GA-0357) - Vessel Name: AAD Workboat Howard Burton - Institutions: GA, RAN, AAD - Country: Australia - Operator: AAD - Multibeam system: Kongsberg EM2040C - Year of installation: 2014 - Nominal sonar frequency: 300 kHz - Number of beams: 400 beams - Beamwidth across track: 1.3° - Beamwidth along track: 1.3° - Pulse length: variable - ...