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Leonora geological map 1:100 000 outcrop geology digital dataset

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: ANZCW0703002987

Title: Leonora geological map 1:100 000 outcrop geology digital dataset


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

A.J.Stewart and S.Liu mapped the outcrop geology on Leonora 3140 1:100 000 map sheet in the Eastern Goldfields, Western Australia, in 1998-99 as part of the National Geoscience Mapping Accord (NGMA). Briefly, mapping consists of geological boundaries/units, faults, fractures, folds, veins, dykes, joints, linears, marker beds, trends, structural measurements, and mines/mineral deposits.

ANZLIC search words:

  • GEOSCIENCES Mapping
  • GEOSCIENCES Geology

Spatial domain:

locality map

Geographic extent polygon: 121 -28.5, 121.5 -28.5, 121.5 -29, 121 -29, 121 -28.5,

Geographic bounding box:
North bounding latitude: -28.5 °
South bounding latitude: -29 °
East bounding longitude: 121.5 °
West bounding longitude: 121 °

Data currency

Beginning date: 1998-01-01

Ending date: 2000-06-30


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

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

Access constraints:

Licence required.

Free Data Download

Data quality

Lineage:

Geological themes in northeastern three-quarters of area were generated from field observations and stereoscopic interpretation of aerial photographs (1:25 000 colour). In the southwestern quarter, geological themes were generated from stereoscopic interpretation of aerial photographs (1: 80 000 B/W). Geophysical themes were generated from magnetic data (90-m cell size grids derived from airborne magnetic surveys). Mines/mineral deposit locations and information are sourced from Department of Minerals and Energy, Perth, and from Sons of Gwalia Ltd, modified by field and air-photo observations. Topographic themes were derived from orthophoto maps prepared by Kevron in 1997-98, supplemented by data from Australian Survey and Land Information Group (AUSLIG) and Department of Lands and Surveys, Perth (DOLA). Some amendments to the topographic data have been made by the authors. Lineage of topographic data before receipt from AUSLIG and DOLA is uncertain.

Maps were compiled from unrectified photo-overlays on to enlarged orthophotomaps prepared by AGSO from Kevron 1997-98 data. All visible topographic features (individual trees, vegetation patterns, roads, fences, drainage, lake boundaries) were used for spatial control of the geological data. Compilations were digitally captured by scanning and vectorising procedures. Point data with database origins were located by the non-differential GPS method. 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 the orthophoto base maps, and is estimated at up to 10 m. Positional errors generated by distortions in the aerial photos and errors during the data capture process are difficult to quantify, but are believed to be negligible in comparison to the topo base error.

GPS-located features, such as structural measurements, have an initial error of up to 100 m due to selective availability imposed on GPS readings. However, the Kevron orthophotomap digital data included a metric grid, and all GPS readings were refined by plotting the point location on the on-screen orthophotomap and reading off the grid reference. The final error is estimated at 10 m.

Attribute accuracy:

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

Logical Consistency:

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

This map supersedes the first edition of Leonora 1:100 000 geological map released by AGSO in 1992; this depicted large areas of solid-geology separated by large areas of superficial cover.

Completeness:

The level of work undertaken to map the project area varied according to the nature of the geology. Areas with large amounts of outcrop and/or complex geology have been mapped with numerous field observations, while those areas with little or no outcrop and/or simple geology have been mapped with few or no field observations. Reliability and/or Field Observation Localities diagrams are included with each hard-copy release of a 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/ANZCW0703002987.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703002987.xml

ASCII files containing additional metadata are stored with digital data for each sheet.

Authors:Stewart, A.J. Liu, S.F.
SPATIAL INFORMATION FOR THE NATION