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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
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of the American Library
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Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=976253
from Charts and maps (In 1 layer) Depicts: 1822
1822 about 5 hours ago. 5 control points.
?t=t&id=1955066
From Atlas 139. Vol. 4, 1901. (In 2 layers) Depicts: 1884
1884 about 15 hours ago. 13 control points.
?t=t&id=2056521
From Atlas of the State of New York (In 1 layer) Depicts: 1895
1895 about 19 hours ago. 7 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.