[Research] spatial pattern of people talking in mobile phones

Julien Morel in his paper "Une ethnographie de la téléphonie mobile dans les lieux publics" (Réseaux Vol.20, N°112-113, in french) proposes to use topolographies as way to analyse spatial pattern of people who use mobile phones. The french word topolographie (I would say topolography in english) means that you draw the trajectory of the person like the following figure:

The cross depicts stops.