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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=1512208
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 2 hours ago. 40 control points.
?t=t&id=1809080
From Atlas 67. Vol. 2, 1904. (In 1 layer) Depicts: 1884
1884 about 2 hours ago. 7 control points.
?t=t&id=1627553
from Detailed estate and old farm line atlas of the city of Brooklyn : complete in six volumes ... from official records, private plans, and actual surveys ... / by G.M. Hopkins, C.E. (In 1 layer) Depicts: 1880
1880 about 2 hours ago. 4 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.