It’s not perfect, particularly for cities with small footprints. Some measures of density exclude all non-residential land, but the square kilometre grid approach means that partially populated grid parcels are counted, and many of these parcels will include non-residential land, and possibly even large amounts of water. I’ve also generated my own kilometre population grids for Canadian and New Zealand cities by proportionally summing populations of the smallest census parcels available. To overcome the issue of different parcel sizes, I’ve used kilometre grid population data that is now available for both Europe and Australia. As I’ve shown previously, the size of the parcels used makes a big difference in the calculation of population-weighted density, which makes comparing cities difficult internationally. Rather than divide the total population of a city by the entire city area (which usually includes large amounts of sparsely populated land), population weighted density is a weighted average of population density of all the parcels that make up the city. Why Population Weighted Density?Īs discussed in previous posts, population-weighted density attempts to measure the density at which the average city resident lives. It also shows a breakdown of the densities at which these cities’ residents live, and includes a set of density maps with identical scale and density shading.
COMPARE CITIES TO OTHER CITIES PLUS
This post calculates the population-weighted density of 53 Australian, European, and Canadian cities with a population over 1 million, plus the three largest New Zealand cities (only Auckland is over 1 million population). Read on to see 11 of the best creations by Reddit users.Just how much denser are European cities compared to Australian cities? What about Canadian and New Zealand cities? And does Australian style suburbia exist in European cities? The results show the incredible changes that cities are subjected to in the name of visual clarity: in cities such as London, Tokyo, and Berlin, transit maps expand the urban core, masking the density at these regions' centers in other cities such as Washington DC, shortened lines hide the extent of the city's suburbs while in some cities, entire neighborhoods are moved to the other side of the city to make the map layout more attractive (we're looking at you, Prague).
COMPARE CITIES TO OTHER CITIES SERIES
In a fascinating series of posts over at /r/dataisbeautiful earlier this year, Reddit users created GIFs comparing the official metro maps of cities around the world with the real geography those maps correspond to. What these "maps" rarely tell you with any reliability, though, is the actual geography of the city itself. Or, by comparing a metro map to an earlier version from the same city, you can learn about the pace of development being experienced in that city. For example, by comparing metro maps from different cities, you might be able to understand those cities' relative size or level of development. Metro and subway maps can tell us a lot about cities.
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