The repository includes key files necessary for the following two tasks:

1. Georeferencing: converting an image of a geographical map into a georectified data file that allows one to create digital geographical objects that can be later used for a variety of spatial visualizations. Tools: QGIS; Data: a scan of a printed map.

2. Cartogramming: creating cartograms from geospatial data provided as a CSV file (table). Tools: R; Data: a version of geospatial data on the Greco-Roman world from Pleiades, a community-built gazetteer [http://pleiades.stoa.org/].

NB Necessary tools are available at:

• QGIS: http://www.qgis.org/ (check the QGIS Tutorial in the Georeferencing folder)
• R and RStudio: https://www.r-project.org/; https://www.rstudio.com/