[GRASS-user] v.generalize issue

Markus Metz markus.metz.giswork at googlemail.com
Wed Oct 26 14:51:37 EDT 2011

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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