NYPL and maps

The New York Public Library recently launched a new Map Rectifier website that works in conjunction with maps in its Digital Gallery. The site allows zooming, panning, and georectification—a process that allows digital images to be stretched, placing the maps themselves into their geographic context. Once a historical map has been digitally warped, users can virtually “trace” features, such as cities, farm boundaries, rivers, ponds, and even buildings, converting them into digital geospatial data....
NYPL Blogs, Feb. 3