Map(s) of the Week: How we commute
|YVONNE BERG/TORONTO STAR FILE PHOTO|
Nerd box: I've been wondering for a while how to tap the rich mapping potential of the 2006 census. The best local data (economic, social, cultural, educational and so forth) is organized by census tracts, but mapping data by individual tracts would be enormously labour-intensive, particularly in creating the polygons in the first place. Also, even if we went through the exercise of creating polygons of all the census tracts in the GTA, I doubt the map would load.
Then it turned out that StatsCan had tabulated all the same data by electoral districts, which are much more manageable shapes, while still small enough to give a sense of local identity. As an added benefit, we had already mapped all 47 ridings in the GTA for the last provincial election, and the boundaries were ready to be reused. As a further added benefit, it gives us the chance to map data about, for want of a better word, the personality of each district during a federal election.
Once again, I've used Google's Charts API to create individual pie charts for the ridings. Creating these in Excel was fairly painless.