[GRASS-user] Removing small areas using v.clean

[Pierre Roudier]

BTW I confirm I got similar problems with the 6.4 series,

Pierre

2011/9/22 Pierre Roudier <pierre.roudier at gmail.com>:
> Thanks Markus,
>
> Here's an archive containing the input vector layer, along with
> v.clean output:
> https://df.bestgrid.org/quickshare/fb0bb3af778c8a03/vectors.tar.gz
>
> Here's the result of v.info -h on the output:
>
> COMMAND: r.to.vect input="c_means" output="foo" feature="area"
> GISDBASE: /data/GRASSDATA
> LOCATION: NZTM2000 MAPSET: BH USER: roudierp DATE: Thu Sep 15 17:29:53 2011
> ---------------------------------------------------------------------------------
> COMMAND: v.clean input="foo" layer="1"
> type="point,line,boundary,centroid,area,face,kernel" output="bar"
> tool="rmar
> ea" thresh=900
> GISDBASE: /data/GRASSDATA
> LOCATION: NZTM2000 MAPSET: BH USER: roudierp DATE: Thu Sep 15 17:31:45 2011
> [Raster MASK present]
>
> Cheers,
>
> Pierre
>
> 2011/9/21 Markus Metz <markus.metz.giswork at googlemail.com>:
>> On Wed, Sep 21, 2011 at 12:51 AM, Pierre Roudier
>> <pierre.roudier at gmail.com> wrote:
>>> Markus,
>>>
>>> Sorry for this late reply as I was away from keyboard the last few days,
>>>
>>> I encountered this problem while testing the latest grass_svn  (grass
>>> 7). I can give it a shot using a stable version if you want,
>>
>> You can try, but I would be surprised if the result is any different.
>> Can you make the vector available for testing, or can you reproduce
>> this with a vector of the sample datasets?
>>
>> Markus M
>>>
>>> 2011/9/17 Markus Metz <markus.metz.giswork at googlemail.com>:
>>>> On Fri, Sep 16, 2011 at 6:28 AM, Pierre Roudier
>>>> <pierre.roudier at gmail.com> wrote:
>>>>> Dear list,
>>>>>
>>>>> I got a problem as I'm trying to remove small areas of a vector layer
>>>>> using v.clean with the rmarea tool: some of these small areas that are
>>>>> on the boundary of the layer are getting erased rather than being
>>>>> merged with the closest polygon.
>>>>>
>>>>> Is that an expected behaviour?
>>>>
>>>> No, they should always be merged with a neighbouring area along the
>>>> shared boundary. Areas are supposed to be erased only if they are
>>>> isolated, i.e. do not share a boundary with another area. What GRASS
>>>> version are you using? There was a bug which was fixed 2 years ago.
>>>>
>>>> Markus M
>>>>
>>>
>>>
>>>
>>> --
>>> Scientist
>>> Landcare Research, New Zealand
>>>
>>
>
>
>
> --
> Scientist
> Landcare Research, New Zealand
>



-- 
Scientist
Landcare Research, New Zealand