METADATA FOR DIGITAL BOUNDARY FILES

Census of Population and Housing Destination Zones, August 2011 (cat. no. 8000.0)


Data Currency - August 2011

Presentation Format - Digital boundaries

Custodian - Australian Bureau of Statistics/states and territories government Transport authorities


FILE STRUCTURE

File Nomenclature
File names have the format DZN_2011_AUST where:

• <DZN> represents Destination Zones the type of boundaries in these files
• <2011> represents 2011 the year of the Census to which these boundaries apply
• <AUST> indicates the data covers all of Geographic Australia as defined in the Australian Statistical Geography Standard (ASGS): Volume 1 – Main Structure and Greater Capital City Statistical Areas, July 2011 (cat. no. 1270.0.55.001).

Within the files, the states and territories (S/T) are identified by unique one digit codes, as in the table below.

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State and Territory Codes and Names

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Code	S/T
1	New South Wales
2	Victoria
3	Queensland
4	South Australia
5	Western Australia
6	Tasmania
7	Northern Territory
8	Australian Capital Territory
9	Other Territories

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File Attributes
All tables show file type, file name, spatial unit field and the data type.

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FIELD (mid/mif)

FIELD (ESRI shp)

DATA TYPE

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DZN_CODE_2011	DZN_CODE11	Character (9)
DZN_5DIGITCODE_2011	DZN_5DIG11	Character (5)
SA2_MAINCODE_2011	SA2_MAIN11	Character (11)
SA2_5DIGITCODE_2011	SA2_5DIG11	Character (5)
SA2_NAME_2011	SA2_NAME11	Character (50)
STATE_CODE_2011	STE_CODE11	Character (1)
STATE_NAME_2011	STE_NAME11	Character (50)
AREA_ALBERS_SQKM	AREA_SQKM	Float

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DATASET STATUS

Progress - Completed dataset

Maintenance and Update Frequency
No further update for these boundaries are planned. The DZNs will be revised for the 2016 Census of Population and Housing.


ACCESS

Stored Data Format
The digital boundary files are in MapInfo Interchange Format (.mid.mif) and ESRI Shapefile (.shp) format.

MapInfo Interchange Format can be imported directly into MapInfo and other common Geographic Information Systems (GIS) or desktop mapping packages. The .mid.mif files are in text format and can be edited and manipulated for import to less common GIS and CAD systems.

The .mid.mif files cannot be used directly with viewing tools such as MapInfo ProViewer.

Access Constraints
Copyright Commonwealth of Australia administered by the ABS. More information available on the ABS website: https://www.abs.gov.au/Copyright


Datum
Geocentric Datum of Australia 1994 (GDA94)

The digital boundary files have the datum specified as 116 (GDA94). Users of MapInfo 6.0 or later are able to load data sets based on GDA94 directly, without transformation. Earlier versions of MapInfo cannot interpret GDA94 correctly and there may be alignment problems between data sets based on this datum and other earlier datums.


Projection - Geographical (i.e. Latitudes and Longitudes)

Geographic Extent - Geographic Australia


DATA QUALITY

Lineage
Mesh Blocks are the building blocks of the ASGS regions. Mesh Blocks boundaries were created using various sources including the PSMA digital topographic datasets and ABS Statistical Local Area (SLA) boundaries, zoning information from state or territory planning agencies and imagery.

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 meters in urban areas and +/- 10 meters in rural and remote areas
  
• CadLite
  +/- 2 meters in urban areas and +/- 10 meters 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. The accuracy is +/- 2 metres in urban areas and +/- 10 metres in rural and remote areas

Attribute Accuracy
All codes and labels for the DZN 2011 are fully validated.


Logical Consistency
Spatial units are closed polygons. Attribute records without spatial objects have been included in the data for administrative purposes.


Completeness
All geographic levels of the DZN 2011 are represented.


CONTACT INFORMATION

Any questions or comment can be emailed to geography@abs.gov.au