These maps were created using historic maps and atlas images. The digitized maps were overlaid on current maps using MapWarper.net, and were aligned and assembled into navigable maps using ArcGIS. For more details on how these maps were created, see this blog post.
This map was created using the 1929 Atlas and plat book of De Kalb County, Illinois : compiled from surveys and the public records of De Kalb County, Illinois, digitized by the Library of Congress. It is an interactive map that contains the county map, township maps, and detailed city/village maps. See how I created the map here.
This map was created using the 1905 Standard atlas of De Kalb county, Illinois, including a plat book of the villages, cities, and townships of the county. This atlas was digitized by the University of Illinois at Urbana-Champaign (Illinois History and Lincoln Library). This is another map that overlays the township, city, village, and area maps atop of a modern navigable map. (There are some gaps in the middle of some village/city maps; this is due to the map going into the gutter/spine of the book, and the quality of the scans.) See my blog post about this map here.
1872 Kane County, IL map (NEW! in Feb. 2019)
This map was created using the 1872 Combination atlas map of Kane County, Illinois, compiled, drawn and published from personal examinations and surveys. This atlas was digitized by the University of Illinois at Urbana-Champaign. This map overlays the county, township, and city maps over a modern navigable map.
The Family History Librarian 