ST_ISLINE()

All functions > GEOSPATIAL > ST_ISLINE()

Returns TRUE if the geometry or geography is a LineString.

Signatures

Is line

Returns: TRUE if the sub kind is LineString

ST_ISLINE(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 MultiLineString; use ST_ISCOLLECTION for that
• Returns NULL if the input is NULL

Examples

SELECT
    f1 := ST_ISLINE(ST_GEOMFROMTEXT('LINESTRING (0 0, 1 1)')), -- A line is a line
    f2 := ST_ISLINE(ST_GEOMPOINT(1.0, 2.0)) -- A point is not a line
;