Giovanni, You sure its null? Did you do a IS NULL check on it? If you are using PgAdmin III for example it may appear empty if its too large to show.
Leo http://www.postgis.us -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of G. Allegri Sent: Tuesday, June 22, 2010 4:13 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] st_union returning null on various (valid) setsof polygons/multipolygons I forgot to say, I'm working on Windows XP, Postgresql 8.4.4, Postgis 1.5.0 2010/6/22 G. Allegri <[email protected]>: > I'm trying to apply ST_Union on a set of geometries (multypolygons, > most of which containing a single geometry), to test the CascadedUnion > performance, but the most of times it returns a null result. I haven't > been able to find a rule: sometimes it seems to be the number of > geometries, sometimes the order, etc. > Could someone replicate it? Here is a small selection of my layer (it > contains already validated geometries): > http://www.giovanniallegri.it/share/postgis_selection.zip > > thanks a lot, > Giovanni > _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
