Synchronized pan

This OpenStreetMap comparison shows contribution of the OSM community to spatial management of this humanitarian crisis. Humanitarian OpenStreetMap Team was very reactive, starting to map before the Typhoon touch land. Since then, more then 400 contributors contributed to trace roads and buildings.

Source: [Humanitarian OSM Team](http://pierzen.dev.openstreetmap.org/hot/leaflet/OSM-Compare-before-after-philippines.html#15/11.2446/124.9936)