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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=3989954
From Insurance maps of Jersey City, N.J., 1873 : consisting of what was formerly known as "Jersey City", "Hudson City", and "Bergen" ... (In 2 layers) Depicts: 1873
1873 1 day ago. 3 control points.
?t=t&id=1575923
from City atlas of Elmira, New York : from official records, private plans and actual surveys, based upon plans deposited in the Department of Surveys / compiled and published by M.S. Converse & Co. ; engraved by Edward Busch. (In 1 layer) Depicts: 1876
1876 1 day ago. 8 control points.
?t=t&id=1575909
from City atlas of Elmira, New York : from official records, private plans and actual surveys, based upon plans deposited in the Department of Surveys / compiled and published by M.S. Converse & Co. ; engraved by Edward Busch. (In 1 layer) Depicts: 1876
1876 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.