Monday, June 30, 2014

Melbourne Population & Dwelling Density Distribution (2011)

According to Census 2011, Melbourne population (as of 2011) is 3,999,982. There are also 1,572,171 private dwellings in Melbourne metro area. Melbourne covers an area of 9990 square km. Therefore, average population density in Melbourne is 400 person/sq-km and average dwelling density is 157 dwellings/sq-km.

However, the spatial distribution of population and dwelling density is not uniform. Following figures show how population and dwelling density vary as we move away from city center. I drew multiple 10 km rings in ArcGIS overlaid on top the mesh block and population data. Population and dwellings in each ring are counted and divided by the sum of mesh block areas to get the densities.

Dwelling densities vary from more 1800 dwellings/sq-km to near zero. Similarly, population densities vary from more than 4000 persons/sq-km to near zero. Obviously, the average densities decrease as we go farther out from the city center. However, this does not necessarily mean a neighborhood in the middle of the city is always denser than a neighborhood in an outer suburb. One reason that outer suburbs have much average lower density is the existence of vast amount of undeveloped (or non-residential) lands between blocks/neighborhoods.


* UPDATE (03/07/2014)

I have also plotted "ring maps" of dwelling and population density in Melbourne. Starting from a point in CBD, several rings with radius incrementally increasing by 5 km are overlaid on population and dwelling data from Census. The following ring maps may provide a better picture of the spatial distribution of density in Melbourne.

Friday, June 27, 2014

Melbourne Ethnicity Dot Map

We just released our second visualization project "Melbourne Ethnicity Dot Map" trying to show the extent in which Melbourne is ethnically mixed/segregated. The dominant race/ethnicity is obviously white from West Europe, Australia, and New Zealand. Except a few suburbs with non-white (non-West Europe) majority, the rest of the city looks pretty well mixed if you zoom in to the max level. The point is, Melbourne is not as segregated as Chicago or D.C. at all.

Tuesday, June 24, 2014

Changing Melbourne: Population Dot Map of Melbourne (2006-2011)

We just released our first visualization project. The project includes a few informative graphs and a dot map of population (change) in Melbourne. Every dot in the map is a person. We've generated more than 4 million dots to replicate population distribution using Australian census data.

Changing Melbourne: Population Growth