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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
From Series of advertising cards issued by Arbuckle Bros. Coffee Company, each consisting of a map of a country of the world with related illustrations. (In 1 layer) Depicts:
about 1 hour ago. 23 control points.
From Parts (In 2 layers) Depicts:
about 1 hour ago. 17 control points.
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: 1707
about 6 hours ago. 21 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.