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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!

Recipient of the 2012
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 Year Last modified Status
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 15 minutes ago. 3 control points.
From Louisiana (In 5 layers) Depicts: 1875
1875 about 4 hours ago. 6 control points.
From China (In 3 layers) Depicts: 1912
1912 about 5 hours ago. 6 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.