[GRASSLIST:6110] Re: dissolve common boundary

[ivan marchesini]

Dear Hamish, dear Markus...
I have still problem to dissolve boundaries...
I will try to explain better the problem...
I have a lot of areas (a reclassified landuse map) in a vector map...
some of these poligon have the same values in a column of the
database...
for example: two touching areas have the same code=31
I would like that these two ares will became one single area .... and
the same for the other touching areas which have equal code values....

I have tried 
v.extract -d input=landuse output=landuse_diss type=area new=-1
 

but the output is exactly the same map as the input

where I'm wrong???
can you help me??
thank you very much

ivan




Il giorno gio, 10-03-2005 alle 14:43 +1300, Hamish ha scritto:
> > I have a reclassified vector map which have a lot of adiacent area
> > with the same category number ... (no database connection... only
> > category) now I would like to obtain the fusion of the adiacent areas
> > with the same category number...
> 
> 
> 
> v.extract -d
> 
> 
> 
> Hamish
-- 
Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a 
06125
Perugia (Italy)
e-mail: marchesini at unipg.it
        ivan.marchesini at gmail.com
tel: +39(0)755853760
fax: +39(0)755853756