The U.S. Geological Survey is scanning 250,000 of its historic maps to put online. The U.S. Geological Survey (USGS) is nearly halfway through its release of more than 250,000 historical topographic ...

This month the U.S. Geological Survey (USGS) rolled out topoView 2.1, a modern web application built on an open source mapping platform that lets users discover, interact, and download historical USGS ...

This screen shot shows a web app from esri that allows users to over-lay historic maps. The map above shows Harrisburg in the 1970s and the Harrisburg area at the turn of the 20th century. Who doesn't ...

A map of Chicago, Illinois, imprinted in 1913 from the United States Geographical Survey’s historical topographic map collection. Image courtesy of the USGS Map lovers, rejoice! The United States ...

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 ...