Southeast Tasmania and Southern Macquarie Ridge Multibeam Survey (AUSTREA2/20000001S)

Brief description

The Southeast Tasmania and Southern Macquarie Ridge Bathymetry dataset was acquired by the Australian Geological Survey Organisation (AGSO) (Geoscience Australia predecessor) during the AUSTREA-2 marine survey undertaken from 15 January - 9 February 2000 onboard the French Oceanographic and Geoscience Research Vessel N/O L'Atalante using a Simrad EM12D multibeam sonar system. The survey was completed as part of the work to map the foot-of-slope position to support definition of Australia's legal Continental Shelf under the United Nations Convention on the Law of the Sea. This dataset contains 120m-, 160m-, 250m-, 280m-, 300m-, 360m- and 440m-resolution 32-bit floating point GeoTIFF files of the bathymetry in the survey area, derived from the processed EM12D bathymetry data, using CARIS HIPS and SIPS software. This dataset is not to be used for navigational purposes.

Lineage

Maintenance and Update Frequency: asNeeded

Statement: Title: Southeast Tasmania and Southern Macquarie Ridge Bathymetry
eCat: 147364

The 20000001S survey was acquired using a Simrad EM12D multibeam sonar system by the Australian Geological Survey Organisation (AGSO) (Geoscience Australia predecessor) onboard the French Oceanographic and Geoscience Research Vessel N/O L'Atalante in 2000.

The Principal Investigators were Mr George Bernardel (AGSO) and Mr Mark Alcock (AGSO).

Metadata:
The multibeam bathymetry was acquired by the following survey:
- Survey Name: Austrea 2 (20000001S)
- Vessel Name: N/O L'Atalante
- Institution: Australian Geological Survey Organisation
- Country: Australia
- Operator: French Oceanographic and Geoscience Organisation
- Multibeam system: Simrad EM12D
- Year of installation: 1991
- Nominal sonar frequency: 12 kHz
- Number of heads: 1
- Number of soundings: 162
- Beamwidth along track: 1.8 degree
- Beamwidth across track: 3.5 degree
- Pulse length: variable
- Selectable depth range: variable
- Vessel speed: variable
- Start Date: 15/01/2000
- End Date: 09/02/2000
- Start Port: Hobart
- End Port: Bluff (New Zealand)
- Grid resolution: 120m, 160m, 250m, 280m, 300m, 360m, 440m
- Number of grids: 7
- Use Limitation: This dataset is not to be used for navigational purposes.
- Vertical Datum: EGM2008 (~MSL)
- Horizontal Datum: WGS84 (EPSG:4326)

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 conjuction with existing or newly created vessel configuration file(s).
2. Tide with reference to the EGM2008 vertical datum were imported and all data were georeferenced (merged).
3. Auto-resolution CUBE surfaces were generated as reference surfaces for data cleaning.
4. An automated data cleaning was undertaken using a surface cleaning method that utilises the reference surfaces.
5. Further manual cleaning was conducted as required after visual assessment of the auto-cleaned surface.
6. The final grids were produced at resolution nearest the banded depth resolution based on the auto-resolution estimate provided in Caris.
7. The final processed grids were exported as six 32-bit floating point Geotiff files at 120-440m resolutions 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