This function returns the deviation of the processed trajectory object from the original trajectory object.

Syntax

float8 ST_deviation(trajectory traj, trajectory after_oper_traj);

Parameters

Parameter Description
traj The original trajectory object.
after_oper_traj The processed trajectory object, such as the compressed trajectory object.

Examples

select st_deviation(traj, st_compress(traj,0.001)) from traj_test;
    st_deviation     
--------------------- 
0.00919177345596219
(1 row)