[postgis-users] Help with spatial query (bug??)

[strk at refractions.net]

You CANT expect any meaningful result from topological operations
performed on INVALID geometries. Check isvalid().

--strk;

On Wed, Apr 06, 2005 at 02:44:52PM -0700, Brent Wood wrote:
> --- strk at refractions.net wrote:
> 
> > Brent, can you post a simplified test of your problem so we can
> > check on newer geos/postgis versions ?
> > 
> > 2 geometries and 2 queries against them should be enough AFAIKT.
> > 
> > --strk;
> 
> 
> I have attached a short shell script.
> 
> This creates two tables, adds geometry columns and loads some sample data.
> It then runs two queries to illustrate the problem.
> 
> You will need to change the name of the database for this to work, otherwise I
> hope it makes things easy for you to replicate my situation & see the problem.
> 
> 
> Thanks for your help with this....
> 
>   Brent Wood