Georectify with MapWarper

TODO: write this section about using MapWarper, a tool created and hosted by Tim Waters, to upload and georectify a scanned map. This means to properly position a scanned map based on standard coordinates, so that you can place it as an overlay on an interactive map, such as Leaflet Storymaps with Google Sheets.

Anyone can upload and georectify a map on the developer’s public site at, and also see how it’s used by organizations such as the New York Public Library at

Warning: MapWarper is a wonderful open-source tool and platform, but service may be interrupted. As of July 2020, the site warns: “Ran out of disk space. Maps older than 2 years will need re-warping to work. Downtime will happen again.”