[GRASSLIST:9589] Re: v.buffer: area boundary around line? Wanted: howto!

[Otto Dassau]

Am Mittwoch, 21. Dezember 2005 11:22 schrieb Wolfgang Qual:
> Hi List,

Hi,

> I tried to create a new area boundary around a line theme. Thought it would
> be easy to do it like this:
>
> v.buffer in=ausschnitt out=buff_ausschnitt bufcol=gesamtbr type=boundary

I also tried with the spearfish location and a CVS snapshot from today and got 
similar strange results, where the lines (roads) describe a closed ring.

v.buffer in=roads out=roadsbuf buffer=20 type=line                          

  Otto

> But GRASS won't create a new theme. After that, I tried to first create a
> line buffer theme (works fine) and then convert it to a area boundary theme
> using v.type. However, the new area boundary theme does not have the shape
> of the line buffer theme.
>
> BTW, the line theme looks like this (street network):
>
>   ------------------
>
>     |         |       ...but I get s.th.      XXXXXXXXXXXX
>     |         |       like this:              XXXXXXXXXXXX
>
>   --------------                              XXXXXXXXXXXX (area inside)
>
> I would greatly appreciate to receive some hints...
>
>
> Best wishes,
> Wolfgang

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