Historical Topographic Maps on ArcGIS Online

Finally - I have been waiting for that! We can get all kinds of historical aerial photographs and satellite images, but often the earliest (and best) depictions of the land were topographic maps. The historical topo maps for New England have been available for years as high-resolution image files from the UNH Library, but not georeferenced for easy GIS use. Now Esri finally made them available via ArcGIS Online.

• An Introduction to the USGS Historical Topographic Map Collection
• Nice Story Map about topographic maps and the USGS
• USA Historical Topo Maps AGO Layer

This would make a great use for the Swipe App: the most recent topographic map and the earliest topographic map!