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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=1633768
from Atlas of Nassau County, Long Island, N.Y. Complete in one volume. Historical, statistical. Based upon maps on file at the county seat in Mineola and upon private plans and surveys furnished by surveyors and individual owners. Supplemented by careful measurements & field observations by our own corps of engineers. (In 1 layer) Depicts: 1914
1914 2 days ago. 20 control points.
?t=t&id=57268796
From Louisiana (In 5 layers) Depicts: 1860
1860 3 days ago. 3 control points.
?t=t&id=57150213
From Whole (In 4 layers) Depicts: 1882
1882 3 days 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.