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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!

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Cutting Edge Technology in
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Most Recently Rectified Maps

Map Title Year Last modified Status
from Atlas of the entire city of Brooklyn, complete in one volume. From actual surveys and official records by G. W. Bromley & Co. (In 1 layer) Depicts: 1880
1880 1 day ago. 5 control points.
from An atlas of the state of New York : containing a map of the state and of the several counties. / Projected and drawn under the superintendence and direction of Simeon de Witt ... And also the physical geography of the State ... (In 1 layer) Depicts: 1829
1829 1 day ago. 46 control points.
from Atlas of ... Suffolk County, Long Island, New York ... : based upon actual measurements by our own corps of engineers, maps on file at county offices, also maps from actual surveys furnished by individual owners / under the supervision of Merritt B. Hyde. (In 1 layer) Depicts: 1915
1915 1 day ago. 23 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.