ST_IsClosed — Returns TRUE
if the
LINESTRING
's start and end points are coincident.
boolean ST_IsClosed(
geometry g)
;
Returns TRUE
if the LINESTRING
's
start and end points are coincident.
This method implements the OpenGIS Simple Features Implementation Specification for SQL.
This method implements the SQL/MM specification: SQL-MM 3: 7.1.5, 9.3.3
SQL-MM defines the result of
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This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves
postgis=# SELECT ST_IsClosed('LINESTRING(0 0, 1 1)'::geometry); st_isclosed ------------- f (1 row) postgis=# SELECT ST_IsClosed('LINESTRING(0 0, 0 1, 1 1, 0 0)'::geometry); st_isclosed ------------- t (1 row) postgis=# SELECT ST_IsClosed('MULTILINESTRING((0 0, 0 1, 1 1, 0 0),(0 0, 1 1))'::geometry); st_isclosed ------------- f (1 row) postgis=# SELECT ST_IsClosed('POINT(0 0)'::geometry); st_isclosed ------------- t (1 row) postgis=# SELECT ST_IsClosed('MULTIPOINT((0 0), (1 1))'::geometry); st_isclosed ------------- t (1 row)