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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=1505141
from A system of geography, or, A new & accurate description of the earth in all its empires, kingdoms and states : illustrated with history and topography, and maps of every country : fairly engraven on copper, according to the latest discoveries and corrections / by Herman Moll. (In 2 layers) Depicts: 1701
1701 34 minutes ago. 8 control points.
?t=t&id=5189274
From Atlas of the Brooklyn Borough of the City of New York v. 3: Gravesend and Flatlands 31st and 32nd wards (In 3 layers) Depicts: 1899
1899 about 4 hours ago. 5 control points.
?t=t&id=1810033
From Atlas 63. Vol. 1, 1886. (In 1 layer) Depicts: 1884
1884 about 12 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.