Returns a new trajectory object containing the points of a trajectory, within a specified time range, that fall outside a given 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. |
range | The time range, specified as a tsrange value. |
t1 | The start time of the time range. |
t2 | The end time of the time range. |
g | The geometry object to compare against. |
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;