This function returns the nearest distance between trajectory objects 1 and 2 within the specified time range.

Syntax

float8 S​T_nearestApproachDistance(trajectory traj, trajectory traj2);
float8 S​T_nearestApproachDistance(trajectory traj, trajectory traj2, tsrange range);
float8 S​T_nearestApproachDistance(trajectory traj, trajectory traj2, timestamp t1, timestamp t2);

Parameters

Parameter Description
traj1 Trajectory object 1.
traj2 Trajectory object 2.
t1 The start time.
t2 The end time.
range The time range.

Examples

Select ST_nearestApproachDistance((Select traj from traj_table where id=1), (Select traj from traj_table where id=2), '2010-1-1 13:00:00', '2010-1-1 14:00:00');