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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!

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Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=3905969
From Atlas of Atlantic City, New Jersey : including South Atlantic City, Chelsea, Ventnor, Oberon and Longport ; compiled and drawn from official plans and actual surveys (In 2 layers) Depicts: 1896
1896 about 5 hours ago. 4 control points.
?t=t&id=4052040
From District 10 (In 3 layers) Depicts: 1969
1969 about 22 hours ago. 4 control points.
?t=t&id=1647987
from Insurance maps of the city of New York. (In 1 layer) Depicts: 1868
1868 about 23 hours ago. 30 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.