PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual224 / 310path | st_astext-----------+------------{1,1} | POINT(0 1){2,1} | POINT(0 3){2,2} | POINT(3 4){3,1,1} | POINT(2 0){3,1,2} | POINT(2 3){3,1,3} | POINT(0 2){3,1,4} | POINT(2 0){4,1,1} | POINT(3 0){4,1,2} | POINT(3 3){4,1,3} | POINT(6 3){4,1,4} | POINT(6 0){4,1,5} | POINT(3 0){4,2,1} | POINT(5 1){4,2,2} | POINT(4 2){4,2,3} | POINT(5 2){4,2,4} | POINT(5 1){5,1,1,1} | POINT(0 5){5,1,1,2} | POINT(0 8){5,1,1,3} | POINT(4 8){5,1,1,4} | POINT(4 5){5,1,1,5} | POINT(0 5){5,1,2,1} | POINT(1 6){5,1,2,2} | POINT(3 6){5,1,2,3} | POINT(2 7){5,1,2,4} | POINT(1 6){5,2,1,1} | POINT(5 4){5,2,1,2} | POINT(5 8){5,2,1,3} | POINT(6 7){5,2,1,4} | POINT(5 4)(29 rows)See Alsogeometry_dump, Section 8.4, ST_Dump, ST_DumpRings7.9.9 ST_DumpRingsST_DumpRings — Returns a set of geometry_dump rows, representing the exterior and interior rings of a polygon.Synopsisgeometry_dump[] ST_DumpRings(geometry a_polygon);DescriptionThis is a set-returning function (SRF). It returns a set of geometry_dump rows, defined as an integer[] and a geometry,aliased "path" and "geom" respectively. The "path" field holds the polygon ring index containing a single integer: 0 for the shell,>0 for holes. The "geom" field contains the corresponding ring as a polygon.Availability: PostGIS 1.1.3. Requires PostgreSQL 7.3 or higher.NoteThis only works for POLYGON geometries. It will not work for MULTIPOLYGONS