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

[Arnaud Morvan]

Hello Marco,

Note that I'm currently working on a new Algorithm that supersede 
dissolve tool.

Here is how it should look like :

Name : "Aggregate"

Parameters :

     * input vector layer

     * group_by expression (field name or complex expression, possible 
to add conditions on geometry predicates)

     * geometry aggregator : collect (multipart) or combine/union 
(single part)

     * Fields aggregators, for each field :

         aggregate function, input field, delimiter (for the concatenate 
aggregator)

         output filed definition (type, length, precision)

         with possibility to add/remove output fields, import the fields 
from an existing layer

The UI should looks like the Refactor Fields algorithm.

With this it should be possible to set a neighborhood condition in the 
group_by expression.

Cheers

Arnaud


Le 22/02/2017 à 10:32, Marco Grisolia a écrit :
> 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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