xavier garcia acosta wrote:
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?
Yes you're right.
To get this correct you have to add an (empty) attribute table with
exactly the same columns to the boundary vector first. So:
db.describe <your_point_vector> (to get the exact column types)
v.db.addtable <your_line_vector> column="col1 datatype, col2 datatype, ..."
then you succeed with:
v.patch -e <your_point_Vector>,<your_line_vector> out=tmp_patch
v.type tmp_patch out=point_line_vector
The output to v.type should show that you have boundaries and centroids.
Check attributes with
v.db.select <your_line_vector>
--
Micha
Xavier
> Date: Thu, 25 Jun 2009 13:00:35 +0300
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> 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
> >
> >
> > Nuevo Windows Live, un mundo lleno de posibilidades Descu'brelo.
> > <http://www.microsoft.com/windows/windowslive/default.aspx>
> >
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>
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