[GRASSLIST:6121] Re: dissolve common boundary

[Radim Blazek]

ivan marchesini wrote:
> 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

"new   Enter -1 to keep original category ..."

How do you want to dissolve the boundaries and keep different categories?

Radim


> 
> 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