[GRASSLIST:2872] Re: problem with v.buffer

[Leonardo Lami]

Dear all,
I follow your help and it wors very well but if the buffer overlap?
I see that if I convert to rast a vector with two circles overlapped the 
circles take the same value (the value of one of these).
I'd like to have the a rast with the areas not overlapped with the rigth value 
of the vector circles and the area overlapped with a value = at the sum of 
the value of the two circles.
Is posiible that or something near at that?

Thank you very much.

Leonardo


> Ciao,
>
> scusa, ok, now I got your problem. Yes, v.buffer does NOT transfer the
> attributes because of potential buffer overlap (which cannot be resolved
> automatically).
>
> Solution, if circles do not overlap:
>
> #Example for Spearfish data (use v.in.sites to convert old sites data):
>
> v.buffer input=archsites output=circles type=point buffer=200
>
> # change original points to centroids:
> v.type in=archsites out=archcentroids type=point,centroid
>
> # patch circles and centroids:
> v.patch in=archcentroids,circles out=circles_db
>
> # attach attributes, either use
> # db.copy ...
> # or link to the original table:
> v.db.connect map=circles_db table=archsites field=1 key=cat driver=dbf
> database='$GISDBASE/$LOCATION_NAME/$MAPSET/dbf'
>
> d.vect circles_db
> d.what.vect circles_db
>
> I have added this example to the documentation.
>
> Cheers
>
>  Markus
>
> On Fri, Feb 20, 2004 at 03:46:20PM +0100, Leonardo Lami wrote:
> > Dear Markus,
> > I am Leonardo Lami, a collaborator of Paolo Cavallini (Faunalia), and I'm
> > working on a a  environmental model with him.
> > I'm working with the command v.buffer but I have a problem:
> > I'd like to create circle buffer vectors (type area) of some points where
> > the category of  the single circle centroid results to have the value of
> > the category of the relative point.
> >
> > It's possibile to do that in automatic?
> > If not, would it be hard for you make this optional for the command
> > v.buffer?
> >
> > Thank you a lot
> >
> > Leonardo