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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=1692919
From Manhattan Depicts: 1664
1664 about 1 hour ago. 15 control points.
?t=t&id=4011619
From Staten Island (In 1 layer) Depicts: 1853
1853 1 day ago. 10 control points.
?t=t&id=1646239
from Atlas of the city of New York, borough of Richmond, Staten Island. From actual surveys and original plans, by George W. and Walter S. Bromley. (In 1 layer) Depicts: 1917
1917 1 day ago. 9 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.