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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
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Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=57373145
From Vermont (In 5 layers) Depicts: 1875
1875 1 minute ago. 30 control points.
?t=t&id=1957100
From Atlas 159, 1885. (In 2 layers) Depicts: 1884
1884 23 minutes ago. 4 control points.
?t=t&id=5603584
From New York City & Vicinity (In 3 layers) Depicts: 1853
1853 about 8 hours ago. 13 control points.
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.