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Seabed exposure grid of Carnarvon Shelf

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

Dataset citation

ANZLIC unique identifier: ANZCW0703015198

Title: Seabed exposure grid of Carnarvon Shelf


Custodian: Geoscience Australia

Jurisdiction: Australia



The ArcINFO grid is one of the outputs of a finescale hydrodynamic model, the Simulating WAves Nearshore (SWAN) model (Booij et al., 1999; Ris et al., 1999).The grid describes the modelled maximum orbital velocity (m/s) which can be used as estimation of seabed exposure on the Carnarvon Shelf.

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Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 112.8 -21.4, 114.4 -21.4, 114.4 -24.1, 112.8 -24.1, 112.8 -21.4,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -21.4 °
South bounding latitude: -24.1 °
East bounding longitude: 114.4 °
West bounding longitude: 112.8 °

Data currency

Beginning date: 2008-06-17

Ending date: 2008-06-17

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - ArcGIS-grid ArcInfo grid GDA94
Available format type:
DIGITAL - ArcGIS-grid ArcInfo grid GDA94

Access constraints:

This material is released under the Creative Commons Attribution 3.0 Australia Licence.

Free Data Download

Data quality


A finescale hydrodynamic model, the Simulating WAves Nearshore (SWAN) model (Booij et al., 1999; Ris et al., 1999), was developed to estimate seabed disturbance for Carnarvon Shelf. The SWAN model estimates wave propagation using the wave action equation (Hasselmann et al., 1973). The model takes into account refraction of swell waves, plus shoaling, diffraction, dissipation and random waves, but excludes local wave generation by wind. The bathymetry data for the SWAN model was input at 100metre spatial resolution. The model also required three parameters: significant wave height (2 to 4 metres), peak wave period (6 to 14 seconds), and peak wave direction (?p, 220 degree). The model generated five variables (in a plain text file) for each scenario: significant wave height, wave direction, orbital velocity, orbital diameter and maximum orbital velocity. The maximum orbital velocity (unit: m/s) was considered as the best estimate of seabed exposure. The values of maximum orbital velocity were then combined to generate one seabed exposure variable: averaging all 12 scenarios (cs_all_av). This seabed exposure variable was then transformed intoArcINFO grids.

Positional accuracy:

The positional accuracy is largely depended on the input bathymetry grid. Because the bathymetry grid is at 100 metre resolution, the positional accuracy is estimated as 5 metres.

Attribute accuracy:

This is a modelling output. SWAN model has been considered as a good finescale hydrodynamic model suitable for Jervis Bay. The attribute accuracy is thus estimated as moderate to high

Logical Consistency:

The modelling processes and the transforming steps used to generate the grids are consistent



Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address:

Metadata information

Metadata date: 2013-03-08

Additional metadata

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Metadata reference XML:


Authors:Geoscience Australia