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
Map of the boundary line between the states of New York and New Jersey in lands under water in Arthur Kill / "N.Y. commissioners: M.W. Hazeltine, Robert Moore, G.C. Hanus; N.J. commissioners: R.C. Bacot, W. M. Oliver, E.A. Stevens." From Parts (In 6 layers) Depicts: 1890 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1890	1 day ago.	15 control points.
Essex County, Left Page Plate: Township of Clinton / by and under the supervision of Roger H. Pidgeon. From Atlas of Essex County, New Jersey : from actual surveys and official records (In 2 layers) Depicts: 1881 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1881	1 day ago.	6 control points.
Map of New England with adjacent portions of New York & Canada From Parts (In 4 layers) Depicts: 1881 View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1881	2 days ago.	15 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.