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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=1954634
From Atlas 134. Vol. 2, 1915. (In 2 layers) Depicts: 1884
1884 less than a minute ago. 15 control points.
?t=t&id=1954623
From Atlas 134. Vol. 2, 1915. (In 2 layers) Depicts: 1884
1884 13 minutes ago. 6 control points.
?t=t&id=1801366
From v. 1A (In 2 layers) Depicts: 1913
1913 about 19 hours ago. 19 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.