As of April 2021, Mapwarper will no longer be updated by NYPL, and will soon be archived. This means all embedded views utilizing Mapwarper will no longer work once the site is archived. However, all contributions and data will be retained by the Library for future use and research.
Thank you for your interest and use of the tool. You can find our source code and documentation for Mapwarper and other NYPL projects here.
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!
Map of New-York Bay and Harbor and the environs : with colored manuscript additions to show positions of troops and fleets at the Battle of Long Island, 1776 / founded upon a trigonometrical survey under the direction of F.R. Hassler, superintendent of
from New York harbor (In 1 layer) Depicts: 1845
|1845||31 minutes ago.||10 control points.|
from Height district map / City of New York, Board of Estimate and Apportionment. (In 1 layer) Depicts: 1916
|1916||about 22 hours ago.||9 control points.|
from Area district map / City of New York, Board of Estimate and Apportionment. (In 1 layer) Depicts: 1916
|1916||2 days ago.||6 control points.|