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.<br>

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Survey metadata: <br>

This resource includes bathymetry data acquired during the Port Fairy to Portland bathymetry survey acquired by Deakin University during the period of 15 July to 10 November 2020 onboard the MV Yolla using a Kongsberg EM2040c multibeam sonar. The Port Fairy to Portland bathymetry survey was led by Dr. Daniel Ierodiaconour (Deakin University). <br>

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The survey was part of a Victorian Coastal Monitoring Program, which requires bathymetry data to understand offshore sediment dynamics within Victorian state waters. <br>

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Metadata: <br>

The multibeam bathymetry was acquired by the following survey: <br>

- Survey Name: Port Fairy to Portland Survey 2020 (20200012S) <br>

- Vessel Name: MV Yolla<br>

- Institution: Deakin University<br>

- Country: Australia<br>

- Operator: Deakin University<br>

- Multibeam system: EM2040c<br>

- Year of installation: 2013<br>

- Nominal sonar frequency: 300 kHz<br>

- Number of heads: 1<br>

- Number of soundings: 400<br>

- Beamwidth along track: 1.3 degree<br>

- Beamwidth across track: 1.3 degree<br>

- Pulse length: variable<br>

- Selectable depth range: variable<br>

- Vessel speed: variable<br>

- Start Date: 15/07/2020<br>

- End Date: 10/11/20120<br>

- Start Port: Port Fairy<br>

- End Port: Port Fairy<br>

- Grid resolution: 2 m<br>

- Number of grids: 1<br>

- Use Limitation: This dataset is not to be used for navigational purposes. <br>

- This dataset is published with the permission of the CEO, Geoscience Australia<br>

- Vertical Datum: EGM2008 (~MSL) <br>

- Horizontal Datum: WGS84 UTM 54S (EPSG:32754) <br>

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Processing methodology: <br>

This dataset was produced using CARIS HIPS & SIPS and the AusSeabed-recommended processing methodology as follows. <br>

1. A new Caris project was created in conjunction with existing or newly created vessel configuration file(s). <br>

2. The raw swath sonar data files were imported to the project. GGK is the preferred navigation and ellipsoid height source. <br>

3. The POSMV data files were imported to the project to bring in delayed heave, delayed heave RMS. <br>

4. Post-processed POS MV data in POSPAC 8.3.<br>

5. Applied SBETS to data in CARIS (PPK Solution). <br>

6. TPU and GPS tide were computed and all data were georeferenced (merged) to Ellipsoid datum. <br>

7. A CUBE was generated as a reference surface for data cleaning. <br>

8. An automated data cleaning using the surface cleaning method with the reference surface was undertaken. <br>

9. Further manual cleaning was conducted as required after visual assessment. <br>

10. The final grid was produced at an optimum resolution of 2m. <br>

11. At Geoscience Australia, the received GeoTIFF was shifted to EGM2008 using AusCoastVDT and CARIS HIPS and SIPS. <br>

12. The final processed grids were exported as a 32-bit floating point GeoTIFF at 2m resolution, referenced to EGM2008.<br>

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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<br> clientservices@ga.gov 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<br>

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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. <br> Sales@ga.gov 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. <br>

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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 <br> copyright@ga.gov 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 <br>

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