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
Berkeley County, Virginia / Compiled under the direction of Lieut. Col. J.N. Macomb, A.D.C. chf. top. engs. : for the use of Maj. Gen. Geo. B. McClellan, commanding U.S. Army, 1861 ; improved & extended by D.H. Strother, Lt. Col. 3d Va. Cavalry, A.A.D.C. From West Virginia (In 5 layers) Depicts: 1861 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1861	2 days ago.	5 control points.
County map of Virginia and West Virginia. from New general atlas. (In 2 layers) Depicts: 1860 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1860	2 days ago.	4 control points.
Big Flats Village; Big Flats Subscriber's Business Directory.; Horse Heads Subscriber's Business Directory.; Breesport Village from Atlas of Chemung Co., New York : from actual surveys / by and under the direction of F. W. Beers ; assisted by Geo. P. Sanford & others. (In 1 layer) Depicts: 1869 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1869	3 days 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.