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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
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 Atlas of the borough of Manhattan, city of New York. (In 1 layer) Depicts: 1916
1916 about 4 hours ago. 28 control points.
From Counties (In 2 layers) Depicts: 1855
1855 about 22 hours ago. 6 control points.
From Johnson's new illustrated steel plate family atlas : with physical geography and with descriptions geographical, statistical and historical, including the latest federal census, a geographical index, and a chronological history of the Civil War... (In 2 layers) Depicts: 1864
1864 1 day ago. 8 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.