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!
|1911||26 minutes ago.||16 control points.|
|1911||about 2 hours ago.||7 control points.|
|1911||about 3 hours ago.||10 control points.|