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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 Last modified Status
?t=t&id=1627471
from Detailed estate and old farm line atlas of the city of Brooklyn : complete in six volumes ... from official records, private plans, and actual surveys ... / by G.M. Hopkins, C.E. (In 2 layers) Depicts: 1880
1 day ago. 4 control points.
?t=t&id=1627460
from Detailed estate and old farm line atlas of the city of Brooklyn : complete in six volumes ... from official records, private plans, and actual surveys ... / by G.M. Hopkins, C.E. (In 2 layers) Depicts: 1880
1 day ago. 4 control points.
?t=t&id=1627466
from Detailed estate and old farm line atlas of the city of Brooklyn : complete in six volumes ... from official records, private plans, and actual surveys ... / by G.M. Hopkins, C.E. (In 2 layers) Depicts: 1880
1 day ago. 4 control points.