Resumen:
We present a new compressed representation of free trajectories of moving objects. It combines a partial-sums-based structure that
retrieves in constant time the position of the object at any instant, with a
hierarchical minimum-bounding-boxes representation that allows determining if the object is seen in a certain rectangular area during a time
period. Combined with spatial snapshots at regular intervals, the representation is shown to outperform classical ones by orders of magnitude
in space, and also to outperform previous compressed representations in
time performance, when using the same amount of space.
