2011/9/22 Asli Akarsakarya <aslia...@yahoo.com> > > I want to get the extensions of spatial table. Say that there is a spatial > table named 'roads', and a some road geometry inside. I want to fetch the > bounding box (envelope or extension) for that table, that means for all the > roads that it has. > > According the OGC specification, this should be defined in the > "geometry_columns" table. As four columns, "minX", "minY", "maxX" and "maxY". > But I couldn't find it anywhere on my postgis. Yet. > > From which table/view? With what SQL? > > > I would try
SELECT st_envelope( st_collect(geom) ) FROM roads; HTH, Filip
