  This thesis develops and evaluates effective techniques for visualisation of
flows (e.g. of people, trade, knowledge) between places on geographic maps.
This geographically-embedded flow data contains information about geographic
locations, and flows from origin locations to destination locations. We
explored the design space of OD flow visualisation in both 2D and immersive
environments. We do so by creating novel OD flow visualisations in both
environments, and then conducting controlled user studies to evaluate different
designs.
