[GRASS-user] change centroids/area categories by step values (was: areas, isles and centroids - topology doubts about category assignment)

Moritz Lennert mlennert at club.worldonline.be
Sat Aug 9 08:12:02 EDT 2008

On 08/08/08 19:43, G. Allegri wrote:
> I simplify the questions of the previous post:
> I have dissolved completely a polygonal layer [fig.1] producing the
> one in fig.2, which is composed of 21 areas, 21 isles (the same
> features of "areas"), and 11 centroids attached to the "true" areas.
> The 11 centroids has the same category value (=1). Now I need to
> differentiate the 11 areas, so I would need to give the centroids
> unique, different, values.
> I've tried all the combinations with v.edit, v.category, etc.,
> deleting and re-adding categories, but nothing seems to do what I
> need.

Could you be more specific about what exactly you tried, what happended 
and why this does fit your needs ?


v.category in= out= option=del
v.category in= out= option=add

Should do the trick...

> I'm sure it's a stupid task but, how to do it?
> fig.1 www.geospatial.it/allegri/not_dissolved.ong
> fig.2 www.geospatial.it/allegri/dissolved.ong

I get 404 Not Found...


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