Northeast Tasmania Survey 2011 (GA0331)

Brief description

This resource includes bathymetry data acquired during the Northeast Tasmania bathymetry survey acquired by Geoscience Australia and University of Tasmania during the period of 19 – 28 May 2011 onboard the RV Challenger using a Kongsberg EM3002 multibeam sonar. The Northeast Tasmania bathymetry survey was led by Dr. Scott Nichol (Geoscience Australia). The survey was conducted to broadly classify the seabed into hard (bedrock reef), soft (sedimentary) and mixed substrate types at select locations across the Northeast Tasmanian shelf. This dataset contains a 2m-resolution, 32-bit floating point GeoTIFF file of the bathymetry in the study area derived from the processed EM3002 bathymetry data, using CARIS HIPS and SIPS software. Attribution statement: Data was sourced from the NERP Marine Biodiversity Hub. The Marine Biodiversity Hub is supported through funding from the Australian Government's National Environmental Research Program (NERP), administered by the Department of Sustainability, Environment, Water, Population and Communities (DSEWPAC). This dataset is not to be used for navigational purposes. This dataset is published with the permission of the CEO, Geoscience Australia.

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.

Survey metadata:
This resource includes bathymetry data acquired during the Northeast Tasmania bathymetry survey acquired by Geoscience Australia during the period of 19 – 28 May 2011 onboard the RV Challenger using a Kongsberg EM3002 multibeam sonar. The Northeast Tasmania bathymetry survey was led by Dr. Scott Nichol (Geoscience Australia).

The survey was part of a Parks Victoria project to better understand the habitats and associated biodiversity of Bunurong Marine National Park.

Metadata:
The multibeam bathymetry was acquired by the following survey:
- Survey Name: Northeast Tasmania Survey 2011 (GA0331)
- Vessel Name: RV Challenger
- Institution: Geoscience Australia
- Country: Australia
- Operator: Geoscience Australia
- Multibeam system: EM3002D
- Year of installation: 2011
- Nominal sonar frequency: 300 kHz
- Number of heads: 1
- Number of soundings: 160
- Beamwidth along track: 1.3 degree
- Beamwidth across track: 1.3 degree
- Pulse length: variable
- Selectable depth range: variable
- Vessel speed: variable
- Start Date: 19/06/2011
- End Date: 28/06/2011
- Start Port: Hobart, Tasmania
- End Port: Hobart, Tasmania
- Grid resolution: 2 m
- Number of grids: 7
- Use Limitation: This dataset is not to be used for navigational purposes.
- This dataset is published with the permission of the CEO, Geoscience Australia
- Vertical Datum: EGM2008 (Height)
- Horizontal Datum: WGS84 (EPSG:3855)

Processing methodology:
This dataset was produced using CARIS HIPS/SIPS v.11.3.19 and the AusSeabed-recommended processing methodology as follows.
1. A new Caris project was created in conjuction with existing or newly created vessel configuration file(s).
2. Tide with reference to the EGM2008 vertical datum were imported.
3. An auto-resolution Swath Angle was generated as a reference surface for data cleaning.
4. Surface was georefenced to EGM2008 and WGS84 (merged).
5. An automated data cleaning was undertaken using a surface cleaning method that utilises the reference surface.
6. Further manual cleaning was conducted as required after visual assessment of the auto-cleaned surface.
7. The final grid was produced at a resolution nearest the banded depth resolution based on the auto-resolution estimate provided in Caris.
8. The final processed grid was exported as seven 32-bit floating point Geotiff files at 2m resolution referenced to EGM2008.

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