Returns the minimum distance between a trajectory object and a geometry object within a specified time range.
Syntax
float8 ST_nearestApproachDistance(trajectory traj, tsrange range, geometry g);
float8 ST_nearestApproachDistance(trajectory traj, timestamp t1, timestamp t2, geometry g);Parameters
| Parameter | Type | Description |
|---|---|---|
traj | trajectory | The trajectory object. |
range | tsrange | The time range. |
t1 | timestamp | The start of the time range. |
t2 | timestamp | The end of the time range. |
g | geometry | The geometry object to measure distance to. |
Example
The following example returns the minimum distance between the trajectory in each row and a line segment, evaluated over a one-hour window.
SELECT ST_nearestApproachDistance(
traj,
'2010-1-1 13:00:00',
'2010-1-1 14:00:00',
'LINESTRING(0 0, 5 5, 9 9)'::geometry
)
FROM traj_table;