Name
ST_IsValidTrajectory — Tests if the geometry is a valid trajectory.
Synopsis
boolean ST_IsValidTrajectory(geometry line);
Beschreibung
Tests if a geometry encodes a valid trajectory. A valid trajectory is represented as a LINESTRING with measures (M values). The measure values must increase from each vertex to the next.
Valid trajectories are expected as input to spatio-temporal functions like ST_ClosestPointOfApproach
Availability: 2.2.0
This function supports 3d and will not drop the z-index.
Examples
-- A valid trajectory SELECT ST_IsValidTrajectory(ST_MakeLine( ST_MakePointM(0,0,1), ST_MakePointM(0,1,2)) ); t -- An invalid trajectory SELECT ST_IsValidTrajectory(ST_MakeLine(ST_MakePointM(0,0,1), ST_MakePointM(0,1,0))); NOTICE: Measure of vertex 1 (0) not bigger than measure of vertex 0 (1) st_isvalidtrajectory ---------------------- f