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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
Library Services Award from
the Office of Information Policy
of the American Library
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Most Recently Rectified Maps

Map Title Year Last modified Status
From Atlas 120. Vol. 7, 1902. (In 4 layers) Depicts: 1902
1902 2 days ago. 26 control points.
From Atlas 120. Vol. 7, 1902. (In 4 layers) Depicts: 1902
1902 3 days ago. 34 control points.
from County atlas of Cayuga, New York. From recent and actual surveys and records under the superintendence of F. W. Beers. (In 3 layers) Depicts: 1875
1875 3 days ago. 5 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.