I've been overwhelmed by the positive reaction to my National Parks of the United States poster. I want to thank everyone for such kind words. I also want to thank everyone who shared it with others. Several people have asked how I made it so I'll outline process, list my sources and show a few early prototypes as an extra bonus.
Continuing my latest obsession with data visualization, I had some fun with public transportation data. In an attempt to play around with a new color palette and put a different face on old data, I wound up creating what I call Transit Charts.
When I heard that Metra was planning to cut 46 trains from its service in 2012 to make up for high operating costs, I wanted to see just how much of an impact that would have on their schedules—using a technique from 1885. How the final result came about was a mixture of curiosity and fun with a pinch of obsession.