It just got way, way easier to search and browse the US Geological Survey’s collection of historical topographic maps, thanks to a new online map viewer. These maps—more than 178,000 of them—date back ...

“US Topo” is the next generation of topographic maps from the U.S. Geological Survey. Digital US Topo maps are designed to look, feel, and perform like the traditional paper topographic maps for which ...

I've only seen some limited efforts on the local level in the past. The city of Seattle has been collecting landslide data since 1890, so they have a wonderful data bank of historical land-movement ...