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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=433973
from A-Z (In 2 layers) Depicts: 1777
1777 about 2 hours ago. 30 control points.
?t=t&id=ps map cd3 34
From Topographical atlas of the city of New York, including the annexed territory showing original water courses and made land (In 1 layer) Depicts: 1874
1874 about 11 hours ago. 16 control points.
?t=t&id=5188185
From Atlas of the entire city of New York : complete in one volume ; from actual surveys and official records / by G. W. Bromley & Co. 1879 (In 2 layers) Depicts: 1879
1879 2 days ago. 10 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.