  Global Positioning Systems (GPS) are nowadays intensively used in Sport
Science as they permit to capture the space-time trajectories of players, with
the aim to infer useful information to coaches in addition to traditional
statistics. In our application to basketball, we used Cluster Analysis in order
to split the match in a number of separate time-periods, each identifying
homogeneous spatial relations among players in the court. Results allowed us to
identify differences in spacing among players, distinguish defensive or
offensive actions, analyze transition probabilities from a certain group to
another one.
