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The S Dist Structure has four levels of hierarchy in census years, comprising in ascending order: CDs-SLAs-SSDs-S Dists. In non-census years, with CDs undefined, it has only three levels of hierarchy (see diagram 3, Chapter 1).
In this structure, CDs, SLAs and SSDs are confined to those which fall within S Dists. The spatial units relate to each other through aggregation or disaggregation. For example, CDs aggregate to SLAs while SLAs are disaggregates of SSDs. The spatial units within each level of the S Dist Structure do not collectively cover the whole of Australia.
The current S Dist Structure, down to SLA level, is shown in the following table in Chapter 13 of this manual:
S Dist Structure
(showing three hierarchical levels: S Dist-SSD-SLA)