NYPL Map Rectifier beta

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How to use this tool

The NYPL Map Rectifier 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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Most Recently Rectified Maps

Map Title Last modified Status
?t=t&id=1532618
from Sectional aerial maps of the City of New York / photographed and assembled under the direction of the chief engineer, July 1st, 1924. (In 2 layers) Depicts: 1924
2 minutes ago. 6 control points.
?t=t&id=1532592
from Sectional aerial maps of the City of New York / photographed and assembled under the direction of the chief engineer, July 1st, 1924. (In 2 layers) Depicts: 1924
about 1 hour ago. 5 control points.
?t=t&id=1532590
from Sectional aerial maps of the City of New York / photographed and assembled under the direction of the chief engineer, July 1st, 1924. (In 2 layers) Depicts: 1924
about 3 hours ago. 4 control points.