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

[Marco Grisolia]

Hi Arnaud,
thanks for your answer. This algorithm could be very useful and it should
add the neighborhood condition: I will wait for trying it, thanks!

Marco

2017-02-28 10:43 GMT+01:00 Arnaud Morvan <arnaud.morvan at camptocamp.com>:

> 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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