1216.0 - Australian Standard Geographical Classification (ASGC), 1999  
ARCHIVED ISSUE Released at 11:30 AM (CANBERRA TIME) 30/09/1999   
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Contents >> Chapter 2. Main Structure >> Purpose and structure

Purpose

The Main Structure of the ASGC is used to collect and disseminate a broad range of ABS social, demographic and economic statistics. Although the Main Structure is the most widely used and has broad application, the other structures are equally important to their own purposes.

Maps depicting the Main Structure boundaries are provided in chapter 13.


The structure

The Main Structure has five hierarchical levels at Population Census times, comprising in ascending order:
      CDs - SLAs - SSDs - SDs - S/Ts.
In non-census years, CDs are undefined and the Main Structure thus has only four levels of hierarchy.

In this structure, CDs aggregate to form SLAs, SLAs aggregate to form SSDs and this aggregation principle continues up the remaining hierarchical levels. At each hierarchical level, the component spatial units (e.g. SLAs) collectively cover all of Australia (as defined in chapter 1) without gaps or overlaps.

Tables

Details of the Main Structure are shown in the following tables in chapter 12, The Classification Structures.


Broad Main Structure (showing three hierarchical levels: S/T - SD - SSD)
Example: Broad Main Structure
S/TSDSSD
1NEW SOUTH WALES
10Hunter
05Newcastle
10Hunter SD Bal


Detailed Main Structure (showing four hierarchical levels: S/T - SD - SSD - SLA)

Example: Detailed Main Structure
S/TSDSSDSLA
1NEW SOUTH WALES
10Hunter
05Newcastle
1720Cessnock (C)
4650Lake Macquarie (C)
10Hunter SD Bal
2700Dungog (A)
3050Gloucester (A)





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