PostGIS
Description
Returns true if this Geometry has no anomalous geometric points, such as self-intersection or self-tangency. For more information on the OGC’s definition of geometry simplicity and validity, refer to "Ensuring OpenGIS compliancy of geometries"
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This method
implements the OGC Simple
Features Implementation Specification for SQL 1.1. s2.1.1.1
This method
implements the SQL/MM specification. SQL-MM 3: 5.1.8
This function
supports 3d and will not drop the z-index.
Examples
SELECT ST_IsSimple(ST_GeomFromText('POLYGON((1 2, 3 4, 5 6, 1 2))'));
st_issimple
-------------
t
(1 row)
SELECT ST_IsSimple(ST_GeomFromText('LINESTRING(1 1,2 2,2 3.5,1 3,1 2,2 1)'));
st_issimple
-------------
f
(1 row)