A3                      Trajectory
Track-class             Classes "Track", "Tracks", and
                        "TracksCollection"
compare                 Compares objects of class 'Track'
difftrack-class         Class "difftrack"
dists                   Calculate distances between two 'Tracks'
                        objects
downsample              Downsample a 'Track'
frechetDist             Frechet distance
generalize              Generalize objects of class 'Track', 'Tracks'
                        and 'TracksCollection'
stbox                   obtain ranges of space and time coordinates
stcube                  Draw a space-time cube.
storms                  Storm trajectories
