[GRASS-dev] [GRASS-user] generalize polygons including holes

[Markus Metz]

On Fri, Feb 6, 2015 at 10:23 AM, Moritz Lennert
<mlennert at club.worldonline.be> wrote:
> [taking this over to grass-dev]
>
> On 05/02/15 18:23, Markus Metz wrote:
>>
>> On Thu, Feb 5, 2015 at 4:56 PM, Moritz Lennert
>> <mlennert at club.worldonline.be> wrote:
>>>
>>> On 05/02/15 14:49, Markus Metz wrote:
>>>>
>>>>
>>>> On Thu, Feb 5, 2015 at 11:50 AM, Moritz Lennert
>>>> <mlennert at club.worldonline.be> wrote:
>>>>>
>>>>>
>>>>> On 05/02/15 10:06, Markus Metz wrote:
>
>
>>>>>> v.generalize does not distinguish between outer and inner rings, it
>>>>>> simply goes through all boundaries and generalizes each one.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> And this has always been the case or this is specific to GRASS7 ?
>>>>
>>>>
>>>>
>>>> This has always been the case.
>>>
>>>
>>>
>>> Then why doesn't there seem to be any generalization happening for the
>>> hole
>>> boundaries of the test dataset with grass64release ?
>>
>>
>> With the test dataset you provided, GRASS 6.4 does generalize the hole
>> boundaries. I do not have the problem vector of Robert, so I can not
>> say if the hole boundaries in that vector are generalized or not.
>
>
> With a make distleaned, svn updated and recompiled grass64relase, using the
> test data and the commands
>
> v.generalize test method=douglas thresh=100 out=test_gen_100 --o
> v.generalize test method=douglas thresh=500 out=test_gen_500 --o
>
> I get the attached result (red = 100, orange=500). I don't see any
> generalization in the holes as I do with the same commands in GRASS 7.

Hmm, I do get generalization of the holes in G64 (no local changes).

g.version -g
version=6.4.5svn
revision=64438M
date=2015

black: original, red: thresh=100, green: thresh=500

Markus M
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