Historical Topographic Maps - 11 of 11
Historical Topographic Maps FAQs - 11 Found
Georeferencing means that features on the historical maps are tied to the earth's coordinate system using latitude and longitude. Georeferencing then allows the historic quadrangles to be used in a GIS system and combined with other data. Users who download and install the free TerraGo toolbar extension to Adobe Reader will see an interactive coordinate display as they move their mouse across the GeoPDF image.