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Predicted Rocky Substrate

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: ANZCW0703015077

Title: Predicted Rocky Substrate


Custodian: Geoscience Australia

Jurisdiction: Australia



The data represents the possibility that the substrate is rocky. It was created from the averaged

topographic relief layer. The data values range from 0 to 100.

ANZLIC search words:


Spatial domain:

locality map

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

Geographic extent polygon: 109.23 -8.88, 163.19 -8.88, 163.19 -47.19, 109.23 -47.19, 109.23 -8.88,

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

Geographic bounding box:
North bounding latitude: -8.88 °
South bounding latitude: -47.19 °
East bounding longitude: 163.19 °
West bounding longitude: 109.23 °

Data currency

Beginning date: 2009-03-01

Ending date: 2009-03-01

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - ArcGIS-grid ArcInfo grid WGS84
Available format type:
DIGITAL - ArcGIS-grid ArcInfo grid WGS84

Access constraints:

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

Free Data Download

Data quality


Firstly, layers of local relief were created using 3 by 3, 5 by 5, 7 by 7, 9 by 9, 11 by 11, and 13

by 13 pixel-windows. Then a local relief average layer was created from the above layers.

Finally, the rocky layer was created from the averaged local relief layer, which was calculated

using the following functions: y = 100 when x > 500; y = (x-200)/3 when 500 >= x >= 200; y = 0

when x < 200; where x is relief_ave layer and y is the resultant rocky value (between 0 and


Positional accuracy:

The grid was a derived product of the 250 metre bathymetry grid and thus inherited the

positional accuracy of the bathymetry grid. The bathymetry grid incorporates data from surveys

acquired since 1963. Modern surveys which used GPS have a positional accuracy of 5 - 30 m

depending on several factors, while earlier surveys which used dead reckoning and Transit

satellite fixes had positions accurate to 50-2000 m depending upon the water depth and

strength of currents. These surveys overlap in an irregular distribution. The grid cell size is

0.0025 deg (close to 250m), and it is estimated that 90% of cells give depths within 1 cell of

their measured position. Nominal scale: 1:10,000,000 when imaged at 300 dpi.

Attribute accuracy:

Not applicable, as there is not any attribute associated with the raster data.

Logical Consistency:




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

Metadata reference XHTML:

Metadata reference XML:

Huang, Z., Brooke, B.P., and Harris, P.T., 2010. A new approach to mapping marine benthic

habitats using physical environmental data. Continental Shelf Research,


Authors:Huang, Z. Petkovic, P. Webster, M.A.