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!
A map of the provinces of New-York and New Jersey : with a part of Pennsylvania and the Province of Quebec / from the topographical observations of C. J. Sauthier ; engraved and published by Matthew Albert Lotter.
from Charts and maps (In 1 layer) Depicts: 1777
|1777||about 13 hours ago.||12 control points.|
Map of five lots of land in the first ward of the city of New York belonging to the estate of Isaac Minard, deceased
From Financial District (In 2 layers) Depicts: 1833
|1833||1 day ago.||4 control points.|
From Manhattan Land book of the City of New York. Desk and Library ed. 1956 (In 2 layers) Depicts: 1956
|1956||1 day ago.||4 control points.|