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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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Year

Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=2001816
From Atlas 42.61. Vol. 11-11 1/2, 1893. (In 1 layer) Depicts: 1893
1893 7 minutes ago. 22 control points.
?t=t&id=1954929
From Atlas 137. Vol. 3, 1902. (In 2 layers) Depicts: 1884
1884 20 minutes ago. 4 control points.
?t=t&id=2001809
From Atlas 42.61. Vol. 11-11 1/2, 1893. (In 1 layer) Depicts: 1893
1893 27 minutes 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.