I only have a little bit of experience with this, but here are a few tools I've tinkered with:
MapWarper ? http://mapwarper.net ? convert scanned maps or aerial photos into $B!H(Bgeorectified$B!I(B images by identifying points on the map that correlate to known GIS coordinates. You don$B!G(Bt have to know the coordinates ? you can select them from a Google$B!>(Bstyle street map or other online map. The $B!H(Bwarping$B!I(B part refers to the automated process of adjusting for differences in the map projection.
Georeferencer ? http://www.georeferencer.com is very similar.
MapKnitter ? https://mapknitter.org ? Georectified maps, such as those produced by MapWarper (above) can be stitched together to create larger maps. Especially useful for aerial photos.
[Shameless plug: I went on a mapping-for-DH binge last year and wrote a brief comparative summary of the tools I worked with:
I hope this helps,
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Digby, Todd
Sent: Wednesday, March 27, 2019 8:24 AM
To: [log in to unmask]
Subject: [CODE4LIB] Interactive map development question
The University of Florida is looking for help in the development of an interactive map using a historical map as the base layer (St. Augustine, 1764, http://ufdc.ufl.edu/USACH00236/00001). We found an example that has similar functionality at Mt. Vernon, https://www.mountvernon.org/plan-your-visit/map-of-the-estate-gardens/.
We have funding to support the development and I am wondering if anyone in the community has worked with vendors/developers for similar projects. Other suggestions are also welcome.
Todd R. Digby
Chair, Library Technology Services
George A. Smathers Libraries
University of Florida
[log in to unmask]<mailto:[log in to unmask]> - 352.273.2590 (office) - 612.803.4922 (mobile)