After reading this paper that mention using Gantt Chart for analyzing people's location, I made this SVG mock-up to visualize my position over time in EPFL:

Of course, I am not sure this chart is useful per se. First it is not meant to be used as a location awareness tool for user. Maybe it could be more meaningful to be used at a meta level. For instance, by someone who is in a sort of "control room" who has to command people on the field. Second, the point is to put other layer of information on this chart: interaction, communication (even though it is something to quantify).

BTW, things move here, we have nice visualization now !