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Cobar regolith landforms digital data

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: ANZCW0703002363

Title: Cobar regolith landforms digital data


Custodian: Cooperative Research Centre for Landscape Environments and Mineral Exploration

Jurisdiction: Australia



Regolith landforms interpreted and compiled 1995-1996 by D.L. Gibson, (CRC LEME

/AGSO). Revised 1998 by D.L. Gibson (CRC LEME/AGSO).

This dataset provides a broad overview of the type and distribution of regolith

landform units with unique dominant regolith landform associations around the

Cobar area. Data were interpreted from 1:80 000 panchromatic aerial photographs

and Landsat TM imagery with limited field checking.

ANZLIC search words:

  • GEOSCIENCES Geology Mapping

Spatial domain:

locality map

Geographic extent name: BOURKE - WA-2099 - 1:50 000 Map Series - Western Australia

Geographic extent polygon: 145.5 -30, 147 -30, 147 -33, 145.5 -33, 145.5 -30,

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

Geographic bounding box:
North bounding latitude: -30 °
South bounding latitude: -33 °
East bounding longitude: 147 °
West bounding longitude: 145.5 °

Data currency

Beginning date: 1996-10-01

Ending date: Not Known

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - ArcGIS-coverage ArcInfo coverage Universal Transverse Mercator (UTM) AGD66
Available format type:
DIGITAL - shp ArcView shape file ArcView
DIGITAL - ArcGIS-coverage ArcInfo coverage
NONDIGITAL - Map Printed map

Access constraints:

Licence and fee required

Order Product

Data quality


Initial data compiled in 1995/96 for the Cobar 1:500 000 sheet area. The data were captured from interpreted tracings made from 1:80 000 RC9 aerial photographs, Landsat TM imagery, existing NSW Department of Mineral Resources 1:250 000 geological maps and field mapping data onto topographic bases at 1:250 000 derived from AUSLIG 1:250 000 topo sheets (Bourke, Cobar and Nymagee). This compilation sheet was then scanned on an Eagle 3640 Scanner at a resolution of 400dpi. Resultant raster file warped to fit digital graticule generated using Intergraph CAM software. Affine-1 warp was used, with the four corners of the sheet forming tie points. The warped raster file was then vectorised and cleaned using Abakos Provec and Scanfix software. Intergraph Microstation vector data were plotted and visually checked prior to conversion to GIS format. No attribution was attatched to the Microstation data. Microstation vector data were translated to ESRI Arc/Info coverage format using in-house scripts and ESRIs IGDSARC utility. Attribute fields were populated and coverages were built, checked and edited.Arc/Info coverages were then exported to double precision, uncompressed Arc Export format. These were converted to ArcView shape files.

The 1998 revision comprised of updated boundary and attribute data plus a detailed extended look up table of data extracted from AGSOs RTMAP Oracle database.

Positional accuracy:

The 1:250 000 topo base is based on AUSLIG 1:250 000 sheets. No analysis of the positional accuracy of features has been undertaken, however intuitively it is considered that about 95 per cent of all features are within 250 metres of their true position. Data is based on interpretation of 1:80 000 air photos and LandsatTM imagery.

Attribute accuracy:

Classification is based on air photo, landsat TM imagery, limited field checking, and authors own data. Please refer to authors comprehensive explanatory notes in the explanatory_notes directory

Logical Consistency:

Both the geoscientist and the GIS technician have visually checked plots at various stages of the map production process to identify abnormal features positions, gaps in linework. The GIS package ArcInfo was used to do topological consistency checks to detect flaws in the spatial data structure and to flag them as errors. This check ensures that all classified polygons are closed, nodes are formed at the intersection of lines and that there is only one label within each polygon. There is a many to one relationship between the items LANDFORM, REGOLITH_TYPE, and INDURATION within individual regolith landform units (MAP_SYMB). This relationship is expressed in detail in the lookup tables REGO.LUT (ArcInfo version) and "Detailed Regolith Landform Attributes" (ArcView version).


Data are complete to the specifications of the project.

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:

For definitions of regolith types, landform types, induration and geomorphic features refer to: Pain C., Chan R., Craig M., Hazell M., Kamprad J., and Wilford J. (1991). RTMAP: BMR Regolith database field handbook. BMR Record 1991/29

Authors:Gibson, D.L.