A New York Public Library website

NYPL Map Warper

Sign 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
Search for in

Most Recently Rectified Maps

Map Title Last modified Status
from New & accurate description of the earth in all its empires, kingdoms and states (In 3 layers) Depicts: 1701
about 2 hours ago. 48 control points.
from A new systeme of the mathematicks: containing I. Arithmetick, as well natural and decimal, as in species, or the principles of algebra. II. Practical geometry, together with the first six books of Euclid's Elements, as also the eleventh and twelfth, symbo (In 3 layers) Depicts: 1681
about 4 hours ago. 66 control points.
From Atlas 120. Vol. 7, 1902. (In 4 layers) Depicts: 1902
about 22 hours ago. 5 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.