Tessellation is the process Place Forecast uses to link mesh blocks to small areas. Each mesh block is matched to a small area based on where their boundaries overlap. Once linked, all data for that mesh block — population, dwellings, births, deaths, in-migrations, out-migrations — flows into the small area's totals.
Place Forecast can split a mesh block across two or more small areas. This means small area boundaries do not have to follow mesh block edges. Users can define small areas in any shape they need, and the system will cut mesh blocks to fit.
Mesh blocks also link to SA1s and SA2s, but through their ABS codes rather than boundary overlap. In all cases, no person or dwelling is counted twice, and none is left out.