A New York Public Library website

NYPL Map Warper

Log In Create Account

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
Association
Oitp logo 2012
Search for
Year

Most Recently Rectified Maps

Map Title Year Last modified Status
?t=t&id=2055474
From Vol. 1, South (In 2 layers) Depicts: 1902
1902 about 2 hours ago. 44 control points.
?t=t&id=1583022
from Atlas of Chemung Co., New York : from actual surveys / by and under the direction of F. W. Beers ; assisted by Geo. P. Sanford & others. (In 1 layer) Depicts: 1869
1869 about 5 hours ago. 30 control points.
?t=t&id=1401768
from Atlas of New York. (In 1 layer) Depicts: 1838
1838 about 6 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.