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How the Australian Population grid was created
The population grid was built from published, perturbed Mesh Block values of Usual Resident Population (URP) from the 2011 Census of Population and Housing.
All Mesh Blocks with a URP value greater than zero were identified. Within these Mesh Blocks all residential dwelling locations were identified using a variety of sources including the Geocoded National Address File (GNAF), the Australian Government Indigenous Programs & Policy Locations (AGIL), Locality point locations from the Public Sector Mapping Agency (PSMA) and the Gazetteer 2012 from Geoscience Australia (GA ). The vast majority (over 99.9%) of the points used to model the population grid were sourced from GNAF.
The February 2012 edition of GNAF was used to represent August 2011 (Census night) as there is some lag in the appearance of addresses in GNAF.
Within each populated Mesh Block the 2011 URP was distributed equally across all the residential dwellings. The average value assigned to each dwelling was then summed within each 1km˛ grid cell across the country. Figure 1 provides a pictorial view of this process. Looking at the three coloured Mesh Blocks that intersect the central grid cell (in red), the blue Mesh Block has a total population of 16 people which was distributed evenly across the 5 points giving each point an average population of 3.2 people. The pink Mesh Block had an average of 5 people per point, and the orange Mesh Block had an average of 2 people per point. The population of the central grid cell is calculated by summing the six points it contains, giving a population of 20.4 (2+2+5+5+3.2+3.2).
Figure 1 : Example of modelling Mesh Block data to grid using GNAF points
A small number of Mesh Blocks have a Usual Resident Population but contain no points in any of the data sets used to produce the population grid. For these Mesh Blocks, synthetic points were generated evenly across the Mesh Block. The number of synthetic points used was equal to the number of dwellings published in the 2011 Census of Population and Housing.
Capital city boundaries
Australian capital city statistics calculated in this publication used the Greater Capital City Statistical Areas (GCCSA) boundaries which are part of the Australian Statistical Geography Standard (ASGS) 2011. The boundary used for London was the Unitary Authority of Greater London for 2011.
List of Data Sources
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1270.0.55.007 - Australian Population Grid, 2011
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