Name
ST_ForceCurve — Upcast a geometry into its curved type, if applicable.
Synopsis
geometry
ST_ForceCurve(geometry g);
Description
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.
Examples
Code
SELECT 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
);
Output
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))
Figure