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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 Wards 13, 14, 15, 16, 17, 18, 19, 27 & 28. (In 2 layers) Depicts: 1904
1904 about 1 hour ago. 5 control points.
from Charts and maps (In 1 layer) Depicts: 1792
1792 about 12 hours ago. 8 control points.
From Atlas of Atlantic City, New Jersey : including South Atlantic City, Chelsea, Ventnor, Oberon and Longport ; compiled and drawn from official plans and actual surveys (In 2 layers) Depicts: 1896
1896 1 day 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.