This application an image and map georeferencing or “georectification” service to warp or stretch them to fit on real world map coordinates. It is written in Ruby and Rails and was customised it with the OpenStreetMap project in mind, and is all open source
Comparing two different timelines for an aerial image
Example Use Cases
Libraries and other institutions have used it, including the New York Public Library, Harvard, Stanford Universities, Leiden Archives (in The Netherlands), The DOE/NEPA (US Federal Government) and Wikimedia Commons.
NYPL Map Warper basemap to CartoDB, added an annotation for our Office, and slipped a boundary layer