[GRASS-user] Point attributes to a polygons

[xavier garcia acosta]

Yes, you have understood my question. I've tried that you have recommended to
my and now I have the next problem, I've tried to do “v.patch”
with the option “copy also attribute table” with my two GRASS
vector maps and I have the error “Number of columns differ”. Do
you know how can I solve this?

Xavier

> Date: Thu, 25 Jun 2009 13:00:35 +0300
> From: micha at arava.co.il
> To: epistacio at hotmail.com
> CC: grass-user at lists.osgeo.org
> Subject: Re: [GRASS-user] Point attributes to a polygons
> 
> xavier garcia acosta wrote:
> 
> > Hello everybody,
> >
> >
> > I'm working with cadastre information and I've got the next problem. 
> > I've the polygons that represent the plots of the houses but without 
> > any attribute. I've also the points with the attributes of the 
> > previous polygons. That I would like to do is to add the attributes of 
> > the points to the polygons. Has anybody got any idea how to do it?
> >
> Are these GRASS vectors? If so, then "polygons" do not have attributes. 
> An area feature is made of closed boundary lines and the centroid. The 
> boundary lines can belong to several areas, so attributes that are 
> attached to the boundary lines do not represent a particular area. The 
> centroid, on the other hand, will exactly correspond to the area.
> 
> So, if I understand your question, all you have to do is merge the two 
> vectors (v.patch), then convert the points to centroids (v.type) and 
> you're done. The points as centroids already hold the attributes.
> 
> 
> 
> > Thanks
> >
> >
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