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	Last modified	Status
Brooklyn, Vol. 3, Double Page Plate No. 27; Part of Ward 32, Section 25; Map bounded by Paerdegat Basin, Jamaica Bay, Avenue Z; Including E. 68th St., Avenue N, Bergen 12th St. / by and under the direction of Hugo Ullitz. From Volume 3 (In 2 layers) View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	1 minute ago.	4 control points.
Brooklyn, Vol. 3, Double Page Plate No. 5; Part of Wards 31 & 32, Section 23; Map bounded by Avenue K, E. 37th St., Flatlands Ave.; Including Avenue O, Ocean Ave. / by and under the direction of Hugo Ullitz. From Volume 3 (In 2 layers) View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	26 minutes ago.	5 control points.
Brooklyn, Vol. 3, Double Page Plate No. 4; Part of Ward 32, Section 23; Map bounded by Avenue K, Ralph Ave., Avenue O, Flatbush Ave.; Including Flatlands Ave., E. 37th St., Avenue E, E. 38th St., Hubbard PL., E. 40th St.; Sub Plan; Map bounded by A... From Volume 3 (In 2 layers) View Map \| Rectify Map \| Download KML Bibiliographic records: Digital Collections	about 1 hour ago.	5 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.