[GRASS5] Re: d.vector problems Was: v.buffer problems...

[Radim Blazek]

d.vect fills also areas (islands) without category.
Try d.vect cats=1-10000.

Radim

On 12/7/05, Wolf Bergenheim <wolf+grass at bergenheim.net> wrote:
> On 07/12/05 10:23, Radim Blazek wrote:
> > On 12/7/05, Wolf Bergenheim <wolf+grass at bergenheim.net> wrote:
> >
> >>Hi, list!
> >>
> >>I guess that this is a known issue, but when doing v.buff on lines that
> >>form a closed shape v.buffer will extend the buffer to the whole
> >>"inside" as well.
> >
> >
> > That is correct in  my opinion, buffer for a line is created for both sides.
> > If the lines represent closed polygons you should convert them to areas.
> >
>
> not if they are roads and form a grid. In this case I'd like to form a
> buffer zone around a road network, but I also get the areas in between
> the roads, which is something I don't want, and is perhaps not quite
> right? When I convert the road vectors to raster maps and run r.buffer
> on them I get the correct result, however when I convert this raster to
> a vector area I get the same weird filling effect. This got me
> thinking... perhaps it is not v.buff that does wrong, but perhaps d.vect
> is broken instead. Next I opened the buffered vectors in qgis, and there
> they appear properly. So the filling is done by d.vect, or is it
> something else? Anyway there is some error somewhere ):
>
> I'll put some examples on te web soon to ilustrate what I mean.
>
> --
>
> <:3 )---- Wolf Bergenheim ----( 8:>
>
>