PostGIS

ST_ForcePolygonCW — Orients all exterior rings clockwise and all interior rings counter-clockwise.

+ geometry +ST_ForcePolygonCW+ (+ geometry geom );

Forces (Multi)Polygons to use a clockwise orientation for their exterior ring, and a counter-clockwise orientation for their interior rings. Non-polygonal geometries are returned unchanged.

Availability: 2.4.0

This function supports 3d and will not drop the z-index.

This function supports M coordinates.

ST_ForcePolygonCCW , ST_IsPolygonCCW , ST_IsPolygonCW