Topographic Aspect

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

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Dataset citation

ANZLIC unique identifier: ANZCW0703015035

Title: Topographic Aspect

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Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

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Description

Abstract:

The ArcInfo grid was created from the bathymetry data and represents the degree of aspect of a slope surface.

ANZLIC search words:

GEOSCIENCES
MARINE

Spatial domain:

locality map

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

Geographic extent polygon: 106.4 -7.9, 169.6 -7.9, 169.6 -48.2, 106.4 -48.2, 106.4 -7.9,

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

Geographic bounding box:: North bounding latitude: -7.9 °; South bounding latitude: -48.2 °; East bounding longitude: 169.6 °; West bounding longitude: 106.4 °

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Data currency

Beginning date: 2008-08-01

Ending date: 2008-08-01

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Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

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Access

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

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The dataset was created using the 250 m bathymetry grid. The bathymetry grid was first subset into 10 grids, each of which covers an UTM zone (from 49s to 58s). They were then projected into UTM grids. The aspect were calculated for these UTM grids separately using ArcGIS. The resultant grids were projected back to WGS84 and merged. The merged grid was finally resampled to 0.01 DD.

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 0.025 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 isnot any attribute associated with the raster data

Logical Consistency:

Unknown

Completeness:

Complete

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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: sales@ga.gov.au

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Metadata information

Metadata date: 2013-03-08

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Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703015035.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703015035.xml

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

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