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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=1510802
from Mitchell's new general atlas, containing maps of the various countries of the world, plans of cities, etc., embraced in fifty-three quarto maps., forming a series of eighty four maps and plans, together with valuable statistical tables. (In 2 layers) Depicts: 1860
1860 about 1 hour ago. 46 control points.
?t=t&id=489827
from A summary, historical and political, of the first planting, progressive improvements, and present state of the British settlements in North-America ... By William Douglass, M.D. ... Boston, New-England, Printed: (In 3 layers) Depicts: 1755
1755 about 6 hours ago. 8 control points.
?t=t&id=1226448
from Spezialkarte der osterreichisch-ungarischen Monarchie. (In 1 layer) Depicts: 1877
1877 about 9 hours 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.