Elevation map of the Vestal XX, a challenging 20k road race near Binghamton, NY. http://triplecitiesrunnersclub.org/Docs/vxx_recs.html Use http://gpxtruder.xyz/ to convert GPX tracks of your own runs, rides, hikes, or drives to printable models. Mile markers and other options are supported. It generates STL files as well as remixable SCAD code. Some cleanup may be necessary if your slicer can't handle self-intersecting faces.