Demonstrates and explains the "OD map" technique for studying origin-destination data, using historical internal migration in Ireland as an example.
The technique: Visualization of Origins, Destinations and Flows with OD Maps: openaccess.city.ac.uk/537/
The historical geography: Historical Internal Migration in Ireland. openaccess.city.ac.uk/2052/
The poster: Maps for Studying Historical Internal Migration in Ireland: openaccess.city.ac.uk/1312/
Download video from gicentre.org/videos/ireland_od_maps.mov