[GRASSLIST:4191] Re: Adding CATs back to output from v.buffer/v.distance in 5.7 on Linux - Redhat

[Craig Aumann]

Thanks Radim!

v.reclass was the function I needed (and wasn't clued in on). 

I actually had overlapping sites, so this wasn't a bug in v.buffer.  
Cheers!
Craig

On Mon, 2004-08-16 at 02:29, Radim Blazek wrote:
> On Saturday 14 August 2004 01:32, Craig Aumann wrote:
> > GRASS 5.7.0:~/grassalpac > v.category in=wellsselect field=1
> > option=print
> > 9202
> > 42724
> > 57869
> > 58276
> > 62189
> > 65873
> > 67256
> >
> > GRASS 5.7.0:~/grassalpac > v.buffer input=wellsselect output=wellstemp
> > type=point buffer=100
> 
> > Number of nodes     :   12
> > Number of primitives:   12
> > Number of points    :   0
> > Number of lines     :   0
> > Number of boundaries:   6
> > Number of centroids :   6
> > Number of areas     :   6
> > Number of isles     :   6
> > GRASS 5.7.0:~/grassalpac >
> >
> > ---------------------------------------------------
> > DON'T UNDERSTAND WHY THERE ARE ONLY 6 AREAS - THE ORIGINAL POINTS
> > ARE DISTINCT AND DO NOT OVERLAP - EVEN WITH MUCH LARGER BUFFERS THAN I
> > AM USING.
> > ---------------------------------------------------
> 
> It could be a bug, but are you sure that 42724 and 57869 have 
> distinct coordinates? Can you send here an output of
> 'v.out.ascii input=wellsselect'?
> 
> > NOW, WHAT IS THE v.category COMMAND THAT I NEED TO ISSUE TO GET LINK_KEY
> > FROM THE LINKED TABLE COPIED OVER INTO THE CAT FOR A GIVEN FIELD (1 OR
> > 3).  I JUST CAN'T FIGURE THIS OUT.  ALL THE OPTIONS I TRY DON'T HAVE THE
> > DESIRED BEHAVIOR.
> 
> v.reclass input=wellsbuf output=wellsbufcat col=link_key
> 
> What you have done is correct, another way to do that is to extract 
> only boundary from 'wellstemp' (v.extract), convert points in 'wellsselect' 
> to centroids (v.type) and patch them together (v.patch). Unfortunately
> v.extract does not work with type only, so cats must be assigned to boundaries 
> first (v.category).
> 
> Note: this feature is already on TODO list for v.buffer.
> 
> Radim
>