Typhoon Wipha in Izu Oshima island

A screenshot of OpenStreetMap for Izu Oshima island. 

OpenStreetMap users volunteered their time to create a crisis map of Izu Oshima island [ja], a small island to the south of Tokyo where more than a dozen of people were killed by mudslides triggered by this week's deadly Typhoon Wipha. The red dots on the map represent reports submitted by users, which give information on things such as disaster relief, blocked roads, and water supply.