[GRASS-dev] v.buffer2 issues

[Markus Metz]

On Tue, Apr 5, 2011 at 9:40 AM, Maris Nartiss <maris.gis at gmail.com> wrote:
> Hello,
> I'm totally lost in v.buffer/2 issues. I recompiled v.buffer and
> v.buffer2 on 6.5 and was trying out different use cases from trac. All
> of them where working fine with v.buffer2. Old v.buffer was still
> failing with landcover dataset.

Hmph. Updated v.buffer indeed fails with spearfish landcover map.

> I had not tested attribute based
> buffering, as it should not be hard to fix buffering by attribute if
> in general it works fine.
>
Buffering by attributes is now working in both versions. Both versions
still have different problems with generating and cleaning buffers.

> Can anyone give me sample data that triggers failure of v.buffer2?
>
E.g. in nc_spm with roadsmajor:

v.buffer2 input=roadsmajor at PERMANENT output=roadsmajor_buf2_2000 distance=2000

fails, but works fine with updated v.buffer

v.buffer input=roadsmajor at PERMANENT output=roadsmajor_buf1_2000 distance=2000

v.parallel2 has more issues than v.buffer2 (see tickets #1231 and
#1244). According to the relevant thread in the grass-dev ml [1], I
got the impression that Rosen Matev was aware of the problem with
parallel lines, but did not get around to fix it [2] (last mail of
[1]).

Markus M

[1] http://thread.gmane.org/gmane.comp.gis.grass.devel/27534/
[2] http://article.gmane.org/gmane.comp.gis.grass.devel/28445