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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
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Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=1532665
from Sectional aerial maps of the City of New York / photographed and assembled under the direction of the chief engineer, July 1st, 1924. (In 2 layers) Depicts: 1924
1924 about 9 hours ago. 12 control points.
?t=t&id=1532645
from Sectional aerial maps of the City of New York / photographed and assembled under the direction of the chief engineer, July 1st, 1924. (In 2 layers) Depicts: 1924
1924 about 10 hours ago. 4 control points.
?t=t&id=1703781
From Volume 3 (In 3 layers)
about 13 hours 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.