I'm pleasantly surprised at the quality of London, Canada's map of the city trails. I went out for a walk to map some of the forest trails. There was a mixture of semi-gravel paths and paths that had been worn into the ground by people as a short cut from one "official path" to another. I'm thinking as I tread back and forth on "official paths" and the worn ones. that OSM will have the official city map beat. Well as you can surmise, when I got back home to check the "official trail map", the city does a pretty darn good job of their own. Those worn down trails where on the city web site. Looks like I've got my work cut out for me.