NYPL Map Warper: Home -

How to use this tool

The NYPL Map Warper is a tool for digitally aligning ("rectifying") historical maps from the NYPL's collections to match today's precise maps. Visitors can browse already rectified maps or assist the NYPL by aligning a map. Play the video above to tour the site and learn how to rectify a map yourself.

Everyone is welcome to participate!

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Most Recently Rectified Maps

Title	Year	Last modified	Status
Map of the city of Boston and vicinity / Drawn by G.W. & W.S. Bromley, Phila. ; corrected and printed by City of Boston. From Massachusetts (In 5 layers) Depicts: 1896 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1896	about 8 hours ago.	3 control points.
Schonberg's imperial map of the United States and Canada / drawn by Frederick Couëtte. From Whole (In 4 layers) Depicts: 1865 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1865	about 8 hours ago.	4 control points.
Map of the United States and territories / Compiled from the official surveys of the General Land Office, and other authentic sources, under the direction of the Hon. Willis Drummond, commissioner. From Whole (In 4 layers) Depicts: 1873 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1873	about 9 hours ago.	8 control points.

More Rectified Maps...

There are no known US copyright restrictions in maps available through Map Warper.
NYPL is distributing these images under a Creative Commons CC0 1.0 Universal Public Domain Dedication.
For more information, see the Export tab for a map.