PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual221 / 310The original linestrings shown together.The difference of the two linestrings--Safe for 2d. This is same geometries as what is shown for st_symdifferenceSELECT ST_AsText(ST_Difference(ST_GeomFromText(’LINESTRING(50 100, 50 200)’),ST_GeomFromText(’LINESTRING(50 50, 50 150)’)));st_astext---------LINESTRING(50 150,50 200)--When used in 3d doesn’t quite do the right thingSELECT ST_AsEWKT(ST_Difference(ST_GeomFromEWKT(’MULTIPOINT(-118.58 38.38 5,-118.60 38.3296,-118.614 38.281 7)’), ST_GeomFromEWKT(’POINT(-118.614 38.281 5)’)));st_asewkt---------MULTIPOINT(-118.6 38.329 6,-118.58 38.38 5)←↪See AlsoST_SymDifference7.9.7 ST_DumpST_Dump — Returns a set of geometry_dump (geom,path) rows, that make up a geometry g1.Synopsisgeometry_dump[]ST_Dump(geometry g1);