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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=1512209
from Atlas of the city of New York, borough of Manhattan. From actual surveys and official plans / by George W. and Walter S. Bromley. (In 1 layer) Depicts: 1911
1911 about 16 hours ago. 44 control points.
?t=t&id=1602752
from Atlas of Otsego Co., New York. From actual surveys by and under the direction of F.W. Beers, assisted by F.S. Fulmer & others. (In 1 layer) Depicts: 1868
1868 about 16 hours ago. 9 control points.
?t=t&id=1532596
from Sectional aerial maps of the City of New York / photographed and assembled under the direction of the chief engineer, July 1st, 1924. (In 1 layer) Depicts: 1924
1924 1 day ago. 46 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.