The colors in this map of the United States indicate how recently each road has been edited in OpenStreetMap: the oldest data in yellow, the newest in magenta, along a spectrum from Charlie’s sinebow algorithm. The recent bot edits expanding street names stand out in the east.

The image comes from a tool I’ve been working on for visualizing the OpenStreetMap GPS track collection for a workshop at State of the Map US next week. It also turns out to be helpful for visualizing aspects of OpenStreetMap itself, which Tom and I are doing for the OpenStreetMap Data Report session on Saturday.

Data © OpenStreetMap contributors.