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Gordon Downs 1:250 000 geology. Second edition

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: ANZCW0703003839

Title: Gordon Downs 1:250 000 geology. Second edition


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

Mapping of geology on Gordon Downs SE 52-10 1:250 000 map sheet in Western Australia, undertaken 1990-1994 by D.H. Blake, R.G. Warren, AGSO; T.J. Griffin, I.M. Tyler, A.M. Thorne, GSWA, as part of the National Geoscience Mapping Accord (NGMA).

Briefly, mapping consists of geological boundaries/units, faults, folds, veins, dykes, linears, trends, structural measurements, and mineral deposits.

ANZLIC search words:

  • GEOSCIENCES Geology Mapping
  • MINERALS

Spatial domain:

locality map

Geographic extent name: GORDON DOWNS - WA-492 - 1:50 000 Map Series - Western Australia

Geographic extent polygon: 127.5 -18, 129 -18, 129 -19, 127.5 -19, 127.5 -18,

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

Geographic bounding box:
North bounding latitude: -18 °
South bounding latitude: -19 °
East bounding longitude: 129 °
West bounding longitude: 127.5 °

Data currency

Beginning date: 1990-01-01

Ending date: 2000-12-30


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - dat Data file MapInfo Geographic GDA94
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94
NONDIGITAL - Map Printed map
Available format type:
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94
NONDIGITAL - Map Printed map
DIGITAL - dat Data file MapInfo Geographic GDA94

Access constraints:

Licence and fee required

Order Product

Data quality

Lineage:

Geological theme generated from field observations (1990-1994) and interpretation using aerial photographs (1:25 000 colour).

Topographic themes have been provided by AUSLIG with agreement that public release of any topographic data by Geoscience Australia will be in non digital form only. Some amendments to the topographic data have been made by the authors. Lineage of topographic data, prior to receipt from AUSLIG, is uncertain. Maps were compiled from unrectified photo overlays onto

topographic bases supplied by AUSLIG (see notes on topographic data above). Drainage and, where necessary, other topographic features (eg fence lines) were used for spatial control of the geological data. Compilations were digitally captured either by hand or automatically by scanning and vectorising procedures. Point data with database origins have been located largely by non-differential GPS. Some detail may have been generalised, repositioned, or omitted from the primary data for cartographic purposes.

Positional accuracy:

The most prominent horizontal positional inaccuracy in this dataset has been introduced during compilation to topographic base maps, and is estimated at up to 300m. The main source of error is inaccuracies in the location of topographic features on the base maps, which is compounded by insufficient topographic features in some areas of the base maps with which to accurately align the photo overlays. Positional errors generated by distortions in the aerial photos and errors during the data capture process are difficult to

quantify and are believed to be negligible in comparison to the topo base error. GPS located features, such as structural measurements, have an error of up to 100m due to selective availability imposed on GPS readings.

Attribute accuracy:

The bulk of attributes in this data set are qualitative and quantitative geological observations and measurements. Classifications of lithology and linear geological features are largely interpretative, based on conventional mapping techniques (field observations, photo/imagery interpretation, sample collection and analysis), and adhere to well established and standardised classification schemes. Structural measurements are quantitative, measured using standard field mapping instruments.

Logical Consistency:

Rigorous quality control has ensured consistency in data structures and standards across the dataset.

Completeness:

The level of work undertaken to map the project area varies according to the nature of the geology. Areas with large amounts of outcrop have been mapped with numerous field observations, while those tracts of land with little or no outcrop have been mapped with few or no field observations.A Field Site Location diagram is included on the hardcopy map sheet to display the distribution of different levels of mapping.


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

Metadata information

Metadata date: 2013-03-08


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703003839.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703003839.xml

Geoscience Australia's GIS data dictionary can be viewed at http://www.agso.gov.au/information/data_dictionary.html

Authors:Blake, D.H. Warren, R.G. Griffin, T.J. Tyler, I.M. Thorne, A.M.
SPATIAL INFORMATION FOR THE NATION