[GRASS-user] v.generalize issue

[Roger André]

Ah, ok.  The causes, please.

It's a really powerful tool, and I would like to write some additional
documentation on how to use it for generalizing and smoothing large polygon
sets, but first I need to make sure that I can anticipate it's behavior a
little better.  The area attribute swapping was something that I had noticed
as well, but I figured that was just something to be expected.

Also, would it be helpful to have additional testers for some of these?  I'm
not using the raster tools at the moment, but am using the vector tools
quite a bit (console only though).

Roger
--

On Wed, Oct 26, 2011 at 11:51 AM, Markus Metz <
markus.metz.giswork at googlemail.com> wrote:

> Roger André wrote:
> > Hi Markus,
> > That's good to know.  Can you tell me the bug number?  I'd like to review
> > the details of it.
>
> There is no bug number, at least I could not find a corresponding bug
> number. There were a few complaints about v.generalize in the mailing
> lists. In short, you are not the first one to discover this bug.
> Additionally, v.generalize was randomly swapping area attributes. This
> is also fixed.
>
> Since you are asking about a bug number, are you interested in the
> effects or the causes?
>
> Markus M
>
>
> > Thanks,
> > Roger
> > --
> >
> > On Wed, Oct 26, 2011 at 12:23 AM, Markus Metz
> > <markus.metz.giswork at googlemail.com> wrote:
> >>
> >> On Tue, Oct 25, 2011 at 11:07 PM, Roger André <randre at gmail.com> wrote:
> >> > Hello GRASS Community,
> >> > I'm having a problem that I'm hoping you can help me find the source
> of.
> >> > I think that either A) I am trying to use the v.generalize tool
> >> > incorrectly,
> >> > B) that my data has some sort of topological problem which I'm unaware
> >> > of,
> >> > or C) that there is a bug in v.generalize.  The simplest way to
> describe
> >> > what's happening is that I am consistently unable to generalize a
> large
> >> > group of contiguous polygons (African states most recently) without
> >> > losing a
> >> > large number of polygons from my data.  I have tried a variety of
> >> > different
> >> > things, all without success, and now I'd like to ask if someone would
> be
> >> > willing to verify that what I'm seeing isn't a problem of my own
> >> > creation.
> >> >  I've posted my data files at www.macrogis.net/africa, along with a
> >> > before-and-after image of the specific problem I've encountered.  I'm
> >> > using
> >> > GRASS v 6.4.1 which I downloaded from the main website 2 months ago.
> >>
> >> This bug has been fixed in GRASS 6.4.2
> >>
> >> Markus M
> >
> >
>
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