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NYPL Map Warper

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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!

Recipient of the 2012
Cutting Edge Technology in
Library Services Award from
the Office of Information Policy
of the American Library
Association
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Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=56917720
From Parts (In 4 layers) Depicts: 1851
1851 about 8 hours ago. 12 control points.
?t=t&id=5059983
From Manhattan Depicts: 1913
1913 about 19 hours ago. 6 control points.
?t=t&id=56678806
From Counties (In 2 layers) Depicts: 1857
1857 about 22 hours ago. 1 control point.
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.