A few weeks ago, a club I’m a member of was updating its membership information. Since the data was being collected in a Google spread sheet, I thought it would be interesting to create a map visualization to show where the members come from. In this post, we’ll write a map overlay which will generate a display like the one in the following image using data drawn from a Google spread sheet. Basically, we’re going to give a map a nasty rash.
You can also see the map here, or download the files here. Note that the size of each location has been fudged and bears no relation to the values originally collected in the membership survey.