Hi,
I want to remove small areas with v.clean, but there is a problem and I don't
know how to solve it.
In simple terms I would need a sql parameter in v.clean to determine with
which adjacent areas (values, ids,...) the boundary should be removed. Since
this is not included in v.clean, does anybody has a workaround for this?
To better understand the problem I have an illustration here:
http://www.gdf-hannover.de/dassau/muell/vclean_rmarea.png
thanks
Otto
On Fri, 21 Apr 2006 13:09:09 +0200
Otto Dassau <dassau@gdf-hannover.de> wrote:
Hi,
I want to remove small areas with v.clean, but there is a problem and
I don't know how to solve it.In simple terms I would need a sql parameter in v.clean to determine
with which adjacent areas (values, ids,...) the boundary should be
removed. Since this is not included in v.clean, does anybody has a
workaround for this?To better understand the problem I have an illustration here:
How about v.extract -d. There are nice examples in the manual.
Maciek
---------------------
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fotkami pa? i pan?w, serwis przeznaczony jest tylko dla os?b doros?ych.
www.anonseerotyczne.pl
> I want to remove small areas with v.clean, but there is a problem and
> I don't know how to solve it.
>
> In simple terms I would need a sql parameter in v.clean to determine
> with which adjacent areas (values, ids,...) the boundary should be
> removed. Since this is not included in v.clean, does anybody has a
> workaround for this?
>
> To better understand the problem I have an illustration here:
>
> http://www.gdf-hannover.de/dassau/muell/vclean_rmarea.pngHow about v.extract -d. There are nice examples in the manual.
You also might a "v.to.db option=sides" step first, then v.extract.
Hamish
Am Samstag, 22. April 2006 09:41 schrieb Hamish:
> > I want to remove small areas with v.clean, but there is a problem and
> > I don't know how to solve it.
> >
> > In simple terms I would need a sql parameter in v.clean to determine
> > with which adjacent areas (values, ids,...) the boundary should be
> > removed. Since this is not included in v.clean, does anybody has a
> > workaround for this?
> >
> > To better understand the problem I have an illustration here:
> >
> > http://www.gdf-hannover.de/dassau/muell/vclean_rmarea.png
>
> How about v.extract -d. There are nice examples in the manual.You also might a "v.to.db option=sides" step first, then v.extract.
thanks for your help, but in my case I would need to include an "area size"
query in v.extract -d, too.
v.extract -d layer=-1 input=tes output=test2 new=-1 type=area,boundary
where="(AREA >= 625) and (LEFT = -1) or (RIGHT = -1)"
Since layer2 with RIGHT and LEFT is boundary and layer1 with AREA column is a
plygone layer. I can only select on boundaries (right/left) or polygones
(area size), since parameter 'layer' must be > 0 for 'where'..
thanks
Otto
Hamish
