PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual91 / 310This method implements the OpenGIS Simple Features Implementation Specification for SQL 1.1.This method implements the SQL/MM specification. SQL-MM 3: 8.3.2This function supports 3d and will not drop the z-index.Examples--a 2d polygonSELECT ST_Polygon(ST_GeomFromText(’LINESTRING(75.15 29.53,77 29,77.6 29.5, 75.15 29.53)’),4326);--result--POLYGON((75.15 29.53,77 29,77.6 29.5,75.15 29.53))--a 3d polygonSELECT ST_AsEWKT(ST_Polygon(ST_GeomFromEWKT(’LINESTRING(75.15 29.53 1,77 29 1,77.6 29.5 1,75.15 29.53 1)’), 4326));←↪←↪result------SRID=4326;POLYGON((75.15 29.53 1,77 29 1,77.6 29.5 1,75.15 29.53 1))See AlsoST_AsEWKT, ST_AsText, ST_GeomFromEWKT, ST_GeomFromText, ST_LineMerge, ST_MakePolygon7.3.33 ST_PolygonFromTextST_PolygonFromText — Makes a Geometry from WKT with the given SRID. If SRID is not give, it defaults to -1.Synopsisgeometry ST_PolygonFromText(text WKT);geometry ST_PolygonFromText(text WKT, integer srid);DescriptionMakes a Geometry from WKT with the given SRID. If SRID is not give, it defaults to -1. Returns null if WKT is not a polygon.OGC SPEC 3.2.6.2 - option SRID is from the conformance suiteNoteIf you are absolutely sure all your WKT geometries are polygons, don’t use this function.ST_GeomFromText since it adds an additional validation step.It is slower thanThis method implements the OpenGIS Simple Features Implementation Specification for SQL 1.1. s3.2.6.2This method implements the SQL/MM specification. SQL-MM 3: 8.3.6