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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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Cutting Edge Technology in
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Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=1523078
from Atlas of Queens Co., Long Island, New York / compiled from official records, private plans & actual surveys by and under the direction of Chester Wolverton. (In 2 layers) Depicts: 1891
1891 about 5 hours ago. 118 control points.
?t=t&id=1693954
from Long Island City. (In 3 layers) Depicts: 1907
1907 about 6 hours ago. 95 control points.
?t=t&id=1166495
from Charts and maps (In 2 layers) Depicts: 1755
1755 about 7 hours ago. 18 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.