geo_collect_garray geo_makeline_garray geo_npoints geom_array_union geom_boundary geom_buffer geom_centroid geom_convex_hull geom_difference2d geom_intersection2d geom_shortestline2d geom_shortestline3d geom_unary_union line_interpolate_point line_locate_point line_substring

geom_boundary() GSERIALIZED * geom_boundary ( const GSERIALIZED *  gs ) Return the boundary of a geometry. Parameters [in] gs Geometry Note PostGIS function: boundary(PG_FUNCTION_ARGS)