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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!

Recipient of the 2012
Cutting Edge Technology in
Library Services Award from
the Office of Information Policy
of the American Library
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Most Recently Rectified Maps

Map Title Last modified Status
?t=t&id=1511776
from Atlas of the borough of Manhattan, city of New York. (In 2 layers) Depicts: 1916
about 7 hours ago. 7 control points.
?t=t&id=1516441
from Atlas of the city of New York, borough of Manhattan / from actual surveys and official plans by George W. and Walter S. Bromley. (In 2 layers) Depicts: 1916
about 11 hours ago. 4 control points.
?t=t&id=1810470
From Atlas 84. Vol. 7, 1904. (In 4 layers) Depicts: 1904
about 12 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.