GEOGRAPHY METADATA PROFORMA
Dataset Custodian
Title
Australian Standard Geographical Classification (ASGC) Digital Boundaries, Australia (cat. no. 1259.0.30.001)
Custodian
ABS Geography
Email: geography@abs.gov.au
Description
Abstract
The digital boundaries for this edition of the ASGC are consistent with the spatial units described in the structures of the ASGC 2011. Date of effect of this edition is 1 July 2011. Digital boundaries are for Statistical Local Area (SLA), Statistical Subdivision (SSD), Statistical Division (SD), Local Government Area (LGA), Statistical District (SDIST), Major Statistical Region (MSR), Statistical Region (SR), Statistical Region Sector (SRS) and State/Territory (STE).
This is the final edition of the ASGC. To assist in the transition to the new Statistical Geography, the Australian Statistical Geography Standard (ASGS), the 2011 SLAs have been aggregated up from the 2011 Mesh Blocks (MB). The 2011 MBs are also the building blocks for the 2011 ASGS.
Geographic Extent Name
Geographic Australia; including the external territories of Cocos (Keeling) Islands & Christmas Island but excluding all other external territories.
Data Currency
Beginning date: 1 July 2011
End date: 30 June 2012
Data Status
Progress: Completed dataset
Maintenance and Update Frequency: This is the last edition of the ASGC and there will be no further updates.
Data Access
Stored Data Format
Digital as separate files for each level of the ASGC 2011 structures represented.
Available Format Type
MapInfo Interchange Format (.mid/.mif) and ESRI Shapefile Format (.shp)
Access Constraints
Copyright Commonwealth of Australia administered by the ABS.
Data Quality
Lineage
MB boundaries are aggregated up to form the 2011 SLA boundaries. The MB boundaries were created using various sources including the PSMA digital topographic datasets and ABS SLA boundaries, zoning information from state planning agencies and imagery. Higher level spatial units are aggregated from the SLA level.
Positional Accuracy
Positional accuracy is an assessment of the closeness of the location of the spatial objects in relation to their true positions on the earth's surface.
The positional accuracy includes:
- a horizontal accuracy assessment
- a vertical accuracy assessment
Positional accuracy for ABS boundaries is dependent on the accuracy of the features they have been aligned to. ABS boundaries are aligned to a number of layers supplied by PSMA with an accuracy of +/-50 mm. PSMA layers and their positional accuracy are as follows:
- Transport and Topography
- +/- 2 metres in urban areas and +/- 10 metres in rural and remote areas.
- CadLite
- +/- 2 metres in urban areas and +/- 10 metres in rural and remote areas.
- Administrative Boundaries
- Derived from the cadastre data from each Australian State and Territory jurisdiction.
- Greenspace and Hydrology
- Relative spatial accuracy of these themes reflects that of the jurisdictional source data. Generally the accuracy is +/- 2 metres in urban areas and +/- 10 metres in rural and remote areas.
Attribute Accuracy
Geographical area codes and labels are fully validated to the 2011 edition codes and labels of the structures represented. Reference is
Australian Standard Geographical Classification (ASGC) (cat. no. 1216.0).
Logical Consistency
Spatial units are closed polygons. Polygons are attributed with ASGC 2011 codes and labels. Slivers/bow-ties may be present within or between spatial units. These data include attribute records without spatial objects for administrative purposes.
Completeness
Four structures defined for the ASGC 2011 are represented - all levels of each of those structures are represented. The four structures represented are the Main Structure, Local Government Area Structure, Statistical District Structure and Statistical Region Structure.
Mesh Block (MB) digital boundaries are available from the
Australian Statistical Geography Standard (ASGS): Volume 1 - Main Structure and Greater Capital City Statistical Areas, July 2011 (cat no. 1270.0.55.001).
Co-ordinate Systems
Datum
All ABS spatial data is sourced from an Oracle Spatial Database. The datum used is defined by the following Oracle WKT:
Longitude / Latitude (GDA 94)
GEOGCS [ "Longitude / Latitude (GDA 94)",
DATUM ["GDA 94",
SPHEROID ["GRS 80", 6378137, 298.257222101]],
PRIMEM [ "Greenwich", 0.000000 ],
UNIT ["Decimal Degree", 0.01745329251994330]]
Projection
Geographical (ie. latitudes and longitudes)
Metadata Date
July 2011
Copyright Commonwealth of Australia administered by the ABS
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