[Qgis-developer] New feature proposal for the Dissolve tool

[Daan Goedkoop]

Yes, apparently the dissolve tool merges adjacent geometries into a
single "part" when operating on polygons, but not when operating on
lines.

2017-02-22 11:46 GMT+01:00 Marco Grisolia <marco.grisolia5 at gmail.com>:
> Hmm maybe I'm wrong, but I think it will only return singleparts without
> taking care of an adjacency criterion (even if ran after the dissolving
> operation).
> Marco
>
> 2017-02-22 11:37 GMT+01:00 Anita Graser <anitagraser at gmx.at>:
>>
>> You can run multiplart to singlepart afterwards.
>>
>>
>> On Wed, Feb 22, 2017 at 11:18 AM, roy roy <royroge at outlook.com> wrote:
>>>
>>> Hi Anita, that does not do what Marco is asking for, because you get a
>>> multipart geometry;
>>>
>>> he needs a linestring geometry I think...
>>>
>>>
>>> Il 22/02/2017 11:10, Anita Graser ha scritto:
>>>
>>> Hi Marco,
>>>
>>> The Dissolve tool already has a "unique fields" option. It sounds like
>>> you are reinventing that.
>>>
>>> Best wishes,
>>> Anita
>>>
>>>
>>>
>>> On Wed, Feb 22, 2017 at 10:32 AM, Marco Grisolia
>>> <marco.grisolia5 at gmail.com> wrote:
>>>>
>>>> Hi,
>>>> I recently answered to a question on GIS StackExchange [0]. In this
>>>> question, the asker was looking for a way for dissolving features using an
>>>> adjacency criterion instead of using common attribute field (please, follow
>>>> the link below for a better understanding). This feature is already
>>>> available in the analogous ArcGIS tool when the"Create multipart features"
>>>> option is enabled and I think it could be of interest having an additional
>>>> option like this in the "Dissolve" tool main dialog for next releases.
>>>> I never submitted a feature request on the QGIS Project site but, since
>>>> there is already a (very rough) code and a general idea on how to approach
>>>> the issue, I didn't know if this was the case of adding it there. Otherwise,
>>>> let me know if I need to add it on the QGIS Project site (if this is the
>>>> case, I'm sorry for wasting your time).
>>>> Regards,
>>>> Marco
>>>>
>>>>
>>>> [0]
>>>> http://gis.stackexchange.com/questions/228267/merging-adjacent-lines-in-qgis
>>>>
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>>>
>>>
>>>
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