A transport network model of the Roman Empire
A long time ago in 2014, I posted about Orbis: The Stanford Geospatial Network Model of the Roman Empire. Orbis is a free online tool that allows one to estimate transportation costs in the Roman Empire. The tool indicates what would have been the likely route and duration of a journey given the selected season, transport mode, etc. It allows one to interactively explore transport routes, path trees, isochrones, cartograms etc. Orbis was developed by Walter Scheidel and Elijah Meeks.
There are a few short videos showing how to export data and to navigate the interactive maps of the project.