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

[Marco Grisolia]

Thanks to all for the answers! I really appreciate.

@Daan, actually it should work for all the features for a specific field (I
set it inside the code, but it may easily become an input parameter). So,
after the setting of a specific field, the code will dissolve all the
features which have the same attribute and that are adjacent (see the
sample image in the answer).

@Anita, I think would be a new feature because, starting from the features
with the same attribute value, I try to only dissolve those ones which are
adjacent (so, it should be an additional feature to the "Unique ID fields"
option).

@roy roy, I never used that tool but it does the same thing I'm trying to
do for linestring geometries. It could be interesting having a similar
feature (for both polygon and linestring vector) in the QGIS geoalgorithms!

Regards,
Marco

2017-02-22 11:18 GMT+01:00 roy roy <royroge at outlook.com>:

> 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-ad
>> jacent-lines-in-qgis
>>
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