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.
Syntax
trajectory ST_difference(trajectory traj, tsrange range, geometry g);
trajectory ST_difference(trajectory traj, timestamp t1, timestamp t2, geometry g);Parameters
| Parameter | Description |
|---|---|
| traj | The trajectory object. |
| t1 | The start time. |
| t2 | The end time. |
| range | The time range. |
| g | The specified geometry object. |
Example
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;