ST_ISPOLYGON()

All functions > GEOSPATIAL > ST_ISPOLYGON()

Returns TRUE if the geometry or geography is a Polygon.

Signatures

Is polygon

Returns: TRUE if the sub kind is Polygon

ST_ISPOLYGON(geo: T) → BOOLEAN

With:

• T : Custom types: GEOM_POINT | GEOM_LINESTRING | GEOM_POLYGON | GEOM_MULTIPOINT | GEOM_MULTILINESTRING | GEOM_MULTIPOLYGON | GEOM_MULTIANY | GEOG_POINT | GEOG_LINESTRING | GEOG_POLYGON | GEOG_MULTIPOINT | GEOG_MULTILINESTRING | GEOG_MULTIPOLYGON | GEOG_MULTIANY

Signature notes:

• Transpiled as a ST_GEOMETRYTYPE comparison; the type label varies by engine
• Returns FALSE for MultiPolygon; use ST_ISCOLLECTION for that
• Returns NULL if the input is NULL

Examples

SELECT
    f1 := ST_ISPOLYGON(ST_GEOMFROMTEXT('POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))')), -- A polygon is a polygon
    f2 := ST_ISPOLYGON(ST_GEOMPOINT(1.0, 2.0)) -- A point is not a polygon
;