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.
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.”