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!

Most Recently Rectified Maps

Title	Last modified	Status
Prussia, and the German States. from New general atlas. (In 2 layers) Depicts: 1860 View Map \| Edit/Rectify Map \| Download KML Bibiliographic records: Digital Gallery \| CATNYP	about 1 hour ago.	20 control points.
Double Page Plate No. 27, Part of Ward 24, Section 11. Bounded by Aqueduct Avenue, E. 190th Street, Tee Taw Avenue, Kingsbridge Road, Aqueduct Avenue, E. 192nd Street, Jerome Avenue, E. 191st Street, Morris Avenue and E. 184th Street. from Atlas of the borough of the Bronx, city of New York : based upon official plans and maps on file in the various city offices; supplemented by careful field measurements and personal observations, by and under the supervision of Hugo Ullitz. (In 2 layers) Depicts: 1901 View Map \| Edit/Rectify Map \| Download KML Bibiliographic records: Digital Gallery \| CATNYP	about 14 hours ago.	10 control points.
Block No. 576 Map bounded by 92th Street, 5th Avenue, 91th Street, 6th Avenue from Maps & profiles of ground for new reservoir situated between 86th and 96th streets and between 5th and 7th avenues. (In 2 layers) View Map \| Edit/Rectify Map \| Download KML Bibiliographic records: Digital Gallery \| CATNYP	about 14 hours ago.	4 control points.

More Rectified Maps...