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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=5217074
From Manhattan Land book of the City of New York. Desk and Library ed. 1956 (In 3 layers) Depicts: 1956
1956 5 minutes ago. 7 control points.
?t=t&id=5217065
From Manhattan Land book of the City of New York. Desk and Library ed. 1956 (In 3 layers) Depicts: 1956
1956 16 minutes ago. 10 control points.
?t=t&id=1809151
From Atlas 69. Vol. 3, 1887. (In 4 layers) Depicts: 1884
1884 17 minutes ago. 9 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.