ST_ForceCurve — Upcast a geometry into its curved type, if applicable.
geometry
ST_ForceCurve(
geometry g)
;
Turns a geometry into its curved representation, if applicable: lines become compoundcurves, multilines become multicurves polygons become curvepolygons multipolygons become multisurfaces. If the geometry input is already a curved representation returns back same as input.
Availability: 2.2.0
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves.
SELECT ST_AsText( ST_ForceCurve( 'POLYGON((0 0 2, 5 0 2, 0 5 2, 0 0 2),(1 1 2, 1 3 2, 3 1 2, 1 1 2))'::geometry ) ); st_astext ---------------------------------------------------------------------- CURVEPOLYGON Z ((0 0 2,5 0 2,0 5 2,0 0 2),(1 1 2,1 3 2,3 1 2,1 1 2)) (1 row)