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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 Last modified Status
?t=t&id=1258618
from Manhattan (In 3 layers)
about 15 hours ago. 10 control points.
?t=t&id=1523121
from Atlas of the city of New York : from official records, private plans & actual surveys / compiled under the supervision of E. Robinson & R. H. Pidgeon. (In 2 layers) Depicts: 1888
1 day ago. 4 control points.
?t=t&id=1523125
from Atlas of the city of New York : from official records, private plans & actual surveys / compiled under the supervision of E. Robinson & R. H. Pidgeon. (In 2 layers) Depicts: 1888
1 day ago. 8 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.