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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=1584305
from New topographical atlas of Jefferson Co., New York : From actual surveys / by S.N. & D.G. Beers and assistants. (In 3 layers) Depicts: 1864
1864 about 8 hours ago. 4 control points.
?t=t&id=1584306
from New topographical atlas of Jefferson Co., New York : From actual surveys / by S.N. & D.G. Beers and assistants. (In 3 layers) Depicts: 1864
1864 about 9 hours ago. 4 control points.
?t=t&id=5082502
From Staten Island (In 3 layers) Depicts: 1853
1853 about 22 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.