ST_IsSimple¶

Tests if geometry’s only self-intersections are at boundary points.

Usage¶

boolean ST_IsSimple(geom: geometry)

Arguments¶

geom (geometry): Input geometry

Description¶

Returns true if the geometry has no anomalous geometric points such as self-intersections or self-tangency.

Examples¶

SELECT ST_IsSimple(
  ST_GeomFromWKT('POLYGON((1 1, 3 1, 3 3, 1 3, 1 1))')
);

┌─────────────────────────────────────────────────────────────────────────┐
│ st_issimple(st_geomfromwkt(Utf8("POLYGON((1 1, 3 1, 3 3, 1 3, 1 1))"))) │
│                                 boolean                                 │
╞═════════════════════════════════════════════════════════════════════════╡
│ true                                                                    │
└─────────────────────────────────────────────────────────────────────────┘