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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=3928455
From V. 1, 1911. (In 4 layers) Depicts: 1911
1911 about 9 hours ago. 21 control points.
?t=t&id=1633973
from Atlas of ... Suffolk County, Long Island, New York ... : based upon actual measurements by our own corps of engineers, maps on file at county offices, also maps from actual surveys furnished by individual owners / under the supervision of Merritt B. Hyde. (In 3 layers) Depicts: 1915
1915 about 11 hours ago. 6 control points.
?t=t&id=1583026
from Atlas of Chemung Co., New York : from actual surveys / by and under the direction of F. W. Beers ; assisted by Geo. P. Sanford & others. (In 3 layers) Depicts: 1869
1869 about 13 hours ago. 3 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.