This topic describes the ST_IsSimple function. This function returns true if the input geometry object has no self-intersection points.
Syntax
boolean ST_IsSimple(geometry geomA);Parameters
| Parameter | Description |
|---|---|
| geomA | The geometry object that you want to specify. |
Description
This function supports 3D objects and does not delete z coordinates.
Examples
- If you execute the following statement, the function returns true:
SELECT ST_IsSimple('LINESTRING(0 0,0 2,2 0,0 0)'::geometry); st_issimple ------------- t (1 row) - If you execute the following statement, the function returns false:
SELECT ST_IsSimple('LINESTRING(0 0,0 2,0 0)'::geometry); st_issimple ------------- f (1 row)