James Cheshire (UCL) have used R to create this incredible map showing some European shipping routes between 1750 and 1850. What struck me most is the existence of a remarkable dataset like this, containing digitised information from the log books of ships.
Congratulations to the team that has done such a great work recovering these data! And congratulations to James who has recently published his map.
[Image Credit: James Cheshire]
Related Link: An animation 100 Years of ships