Vanderford Glacier Multibeam Survey (20210002S)

Brief description

The Vanderford Glacier bathymetry survey was acquired by the Australian Antarctic Division (AAD) during the maiden Antarctic voyage of the RSV Nuyina from 23 December 2021 – 30 January 2022. The survey area encompasses Vincennes Bay (offshore Vanderford Glacier), and offshore Casey Station and Davis Station and was completed as a combination of commissioning trials, ice trials and a resupply voyage. Bathymetry data was acquired using a Kongsberg EM 712 and EM 122 and processed using QPS Qimera and Caris HIPS and SIPS. The dataset was then exported to GeoTIFF using CARIS HIPS and SIPS software. This dataset contains nine 5m-, 10m-, 16m-, 20m-, 64m-, 128m-resolution 32-bit floating point GeoTIFF files. This dataset is not to be used for navigational purposes.

Lineage

Maintenance and Update Frequency: asNeeded

Statement: While AusSeabed aims to publish data based on the requirements stated in the AusSeabed multibeam guidelines (version 1, https://australian-multibeam-guidelines.github.io), 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 dataset was produced using CARIS HIPS & SIPS and the AusSeabed-recommended processing methodology as follows.

These surfaces are a 5 to 128 metre Combined Uncertainty and Bathymetry Estimator (CUBE) surfaces with depth, position, density and uncertainty preserved from the original surface.

Survey metadata:
The multibeam bathymetry was acquired by the following survey:
- Survey Name: Davis Casey Stations Vanderford Glacier 20210002S)
- Vessel Name: RSV Nuyina
- Institution: Australian Antarctic Division (AAD)
- Country: Australia
- Operator: N/A
- Multibeam system: Kongsberg EM712 and Kongsberg EM122
- Year of installation: 2018
- Nominal sonar frequency (EM712): 40-100 kHz
- Nominal sonar frequency (EM122): 12 kHz
- Number of heads (EM712): N/A
- Number of heads (EM122): N/A
- Number of soundings (EM712): 800
- Number of soundings (EM122): 864
- Beamwidth along track (EM712): 1°
- Beamwidth along track (EM122): 1°
- Beamwidth across track (EM712): 1°
- Beamwidth across track (EM122): 1°
- Pulse length (EM712): Variable
- Pulse length (EM122): Variable
- Selectable depth range (EM712): Variable
- Selectable depth range (EM122): Variable
- Vessel speed: Variable
- Start Date: 23/12/2021
- End Date: 30/01/2022
- Start Port: Hobart
- End Port: Hobart
- Grid resolution: 5m-128m
- Number of grids: 9
- Use Limitation: This dataset is not to be used for navigational purposes.
- Vertical Datum: EGM2008 (~MSL)
- Horizontal Datum: WGS84 UTM Zone 55S

Processing methodology:
This dataset was produced using CARIS HIPS & SIPS and the AusSeabed-recommended processing methodology as follows.
1. A new Caris project was created in conjunction with existing or newly created vessel configuration file(s).
2. The raw swath sonar data files were imported to the project. GGK is the preferred navigation and ellipsoid height source.
3. The POSMV data files were imported to the project to bring in delayed heave, delayed heave RMS.
4. Post-processed POS MV data in POSPAC 8.3
5. Applied SBETS to data in CARIS (PPK Solution).
6. TPU and GPS tide were computed and all data were georeferenced (merged) to Ellipsoid datum.
7. Nine CUBEs were generated as a reference surface for data cleaning.
8. An automated data cleaning using the surface cleaning method with the reference surface was undertaken.
9. Further manual cleaning was conducted as required after visual assessment.
10. The final grids were produced at optimum resolutions of 5m-128m.
11. The final processed grids were exported as a 32-bit floating point GeoTIFF at 2m resolution, referenced to EGM2008 and projected to WGS-84 UTM50S.

AVAILABILITY Copies of this publication can be obtained from: Commonwealth of Australia (Geoscience Australia) clientservices@ga.gov.au Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378, Canberra, ACT, 2601, Australia Call 1800 800 173,02 6249 9960

DATA QUALITY This dataset has been subject to independent post-production validation and testing. Tests have been performed for data completeness, correct spatial representation, attribute accuracy, logical consistency, metadata completeness and correctness, and where appropriate for compliance with Geoscience Australia's data dictionaries. Errors found in this dataset should be reported to: Corporate Data Manager Geoscience Australia GPO Box 378 Canberra ACT 2601, Australia Email: Sales@ga.gov.au Reported Errors will be rectified in subsequent data releases, if any.

DISCLAIMER This material is copyright Commonwealth of Australia. Other than the Coat of Arms and departmental logo, you may reproduce, distribute, adapt and otherwise freely deal with this material for all purposes (retaining this notice) without charge on the condition that you include the acknowledgement "copyright Commonwealth of Australia (year of publication) and (title of the source)" on all uses. You may not sub-licence this material or use it in a misleading context. While every effort has been made to ensure accuracy, the Commonwealth does not accept any responsibility for the accuracy, completeness or currency of this material, and will not be liable for any loss or damage arising from use of, or reliance on, the material. Nothing in this licence affects the operation of any applicable exception or limitation contained in the Copyright Act 1968. This dataset is not to be used for any navigation purposes. Further information may be obtained by contacting copyright@ga.gov.au

COPYRIGHT (C) Commonwealth of Australia (Geoscience Australia) 2022.

Notes

Purpose
Bathymetry Survey