PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual230 / 31070.383579256063,20.0366393799278 79.9451031602109,14.20583703063 ←↪90.8537670908993,10.615246672502 102.690357210921,9.40285267938019 115,10.6152466725019 ←↪127.309642789079,14.2058370306299 139.1462329091,20.0366393799275 ←↪150.054896839789,27.883579256063 159.616420743937,37.4451031602108 167.463360620072,48.3537670908992 173.29416296937,60.190357210921 ←↪176.884753327498,72.4999999999998 178.09714732062,84.8096427890786 176.884753327498,96.6462329091003 ←↪173.29416296937,107.554896839789 167.463360620072,117.116420743937 159.616420743937,124.963360620072 150.054896839789,130.79416296937 ←↪139.146232909101,134.384753327498 127.309642789079,135.59714732062 115))See AlsoST_Collect, ST_ConvexHull7.9.14 ST_PolygonizeST_Polygonize — Aggregate. Creates a GeometryCollection containing possible polygons formed from the constituent lineworkof a set of geometries.Synopsisgeometry ST_Polygonize(geometry set geomfield);geometry ST_Polygonize(geometry[] geom_array);DescriptionCreates a GeometryCollection containing possible polygons formed from the constituent linework of a set of geometries.NoteGeometry Collections are often difficult to deal with with third party tools, so use ST_Polygonize in conjunction withST_Dump to dump the polygons out into individual polygons.Availability: 1.0.0RC1 - requires GEOS >= 2.1.0.Examples: Polygonizing single linestringsSELECT ST_AsEWKT(ST_Polygonize(the_geom_4269)) As geomtextrepFROM (SELECT the_geom_4269 FROM ma.suffolk_edges ORDER BY tlid LIMIT 45) As foo;geomtextrep-------------------------------------SRID=4269;GEOMETRYCOLLECTION(POLYGON((-71.040878 42.285678,-71.040943 42.2856,-71.0409642.285752,-71.040878 42.285678)),POLYGON((-71.17166 42.353675,-71.172026 42.354044,-71.17239 42.354358,-71.171794 ←↪42.354971,-71.170511 42.354855,-71.17112 42.354238,-71.17166 42.353675)))(1 row)←↪--Use ST_Dump to dump out the polygonize geoms into individual polygonsSELECT ST_AsEWKT((ST_Dump(foofoo.polycoll)).geom) As geomtextrepFROM (SELECT ST_Polygonize(the_geom_4269) As polycoll