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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=57030828
From Connecticut (In 5 layers) Depicts: 1884
1884 about 15 hours ago. 4 control points.
?t=t&id=1994625
From Specialkarte vom westlichen Kleinasien nach seinen eigenen Reisen und anderen grösstenteils noch unveröffentlichten Routenaufnahmen bearbeitet von Heinrich Kiepert = Carte de la partie occidentale de l 'Asie mineure (In 4 layers) Depicts: 1890
1890 1 day ago. 48 control points.
?t=t&id=1994624
From Specialkarte vom westlichen Kleinasien nach seinen eigenen Reisen und anderen grösstenteils noch unveröffentlichten Routenaufnahmen bearbeitet von Heinrich Kiepert = Carte de la partie occidentale de l 'Asie mineure (In 4 layers) Depicts: 1890
1890 1 day ago. 43 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.