This function returns the value of the velocity attribute field at the specified time point.
Syntax
float8 ST_VelocityAtTime (trajectory traj, timestamp t);Parameters
| Parameter | Description |
|---|---|
| traj | The trajectory object. |
| t | The time point. |
Example
Select ST_velocityAtTime(traj, '2010-1-11 23:40:00') From traj_table;