This function returns a new trajectory object that indicates the difference between a trajectory object within the specified time range and the specified geometry object.


trajectory ST_difference(trajectory traj, tsrange range, geometry g);
trajectory ST_difference(trajectory traj, timestamp t1, timestamp t2, geometry g);


Parameter Description
traj The trajectory object.
t1 The start time.
t2 The end time.
range The time range.
g The specified geometry object.


Select ST_difference(traj, '2010-1-1 13:00:00', '2010-1-1 14:00:00', 'LINESTRING(0 0, 5 5, 9 9)'::geometry) from traj_table;