We are big fans of measuring different densities, and conceptualizing density in different ways. From tax density, tax density in 3D, plus an animated version, lot level density of single detached homes over time, estimating FSR from LIDAR data, density treemaps, dot-density maps, comparing Vancouver and Vieanna densities, building height profiles, renter density and net dwelling density, city density patterns and city density timelines. When I saw the following tweet and linked blog post, I of course could not resist to reproduce some of the graphs and explore population-weighted densities.
A quick note following up on a discussion earlier today, where the question came up on how to compare single family with condo (or rental apartment) density. This point comes up a lot and becomes increasingly important as Vancouver densifies. In Vancouver, some single family homes are heavily suited. Legally a single family lot can have the main unit, a secondary suite and a laneway house. Roughly a half of single family homes have a suite, and a couple percent have laneway houses.
District wide enrolment in VSB schools has been on a steady decline for over a decade. At the same time there are areas within the VSB that have seen strong growth in children requiring new schools to get built. Looking at a couple of time series for the VSB District we can see where the problem lies. The children aged 5-17 living in the VSB District is estimated by BC Stats based on a number of data sources, and the number has been declining over the years.
In the last post we compared international city density patterns. While travelling and reading Alain Bertaud’s excellent book Order without Design I decided to slightly expand on the initial images and add bar graphs showing radial density to get an aggregate understanding of density patterns, as well as adding timelines to show how densities have developed over time. I am getting increasingly interested in modelling urban economics, and understanding and quantifying urban densities is a part of that.
I saw the tanaka package fly by on twitter, and in particular liked the application to the world population grid. Cities are interesting beasts, and I like exploring the extent of cities free from political boundaries. I am travelling right now, but I like looking at different ways to calculate and visualize density and could not resist running some inter-city density comparisons. For this, we only show areas with at least 4 people per hectare (or about 1000 people per square mile, the cutoff used by US Census to designate areas as urban), and pick some population density cutoffs above that to show grades of population density.