NYPL Map Warper: Home -

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

Title	Year	Last modified	Status
Cayuga County, Right Page Map of village of Cato / by the Company's corps of expert engineers and draughtsmen ; Otto Barthel, chief engineer. From The new Century atlas of Cayuga County, New York : with farm records (In 1 layer) Depicts: 1904 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1904	21 days ago.	6 control points.
Map of the city of Sheffield, Alabama / Chas. Beockh, c.e. From Alabama (In 5 layers) Depicts: 1885 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1885	22 days ago.	4 control points.
Cayuga County, Left Page Map bounded by Map of Gayuga County, NY / by the Company's corps of expert engineers and draughtsmen ; Otto Barthel, chief engineer. From The new Century atlas of Cayuga County, New York : with farm records (In 1 layer) Depicts: 1904 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1904	22 days ago.	8 control points.

More Rectified Maps...

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.