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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=1808793
From Atlas 61. Vol. A, 1893. (In 1 layer) Depicts: 1884
1884 35 minutes ago. 5 control points.
?t=t&id=1640713
from The sea-atlas : containing an hydrographical description of most of the sea-coasts of the known parts of the world. (In 2 layers) Depicts: 1702
1702 about 2 hours ago. 12 control points.
?t=t&id=5437642
From Maps of North and South America (In 1 layer) Depicts: 1575
1575 about 23 hours ago. 3 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.