描述

测试几何体是否编码了有效的轨迹。有效轨迹表示为 LINESTRING 具有度量(M值)。测量值必须从每个顶点增加到下一个顶点。

有效的轨迹应作为时空函数的输入，例如 ST_ClosestPointOfApproach

可用性：2.2.0

This function supports 3d and will not drop the z-index.

示例

-- 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

另请参阅

ST_ClosestPointOfApproach