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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=5246011
From Volume Two: North of 172nd Street 1938 (In 3 layers) Depicts: 1938
1938 35 minutes ago. 12 control points.
?t=t&id=5246009
From Volume Two: North of 172nd Street 1938 (In 3 layers) Depicts: 1938
1938 about 1 hour ago. 16 control points.
?t=t&id=1583135
from New topographical atlas of Chautauqua County, New York. From actual surveys especially for this atlas. (In 1 layer) Depicts: 1867
1867 about 1 hour ago. 11 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.