[Qgis-user] WG: Aggregation of adjacent polygons of the same type
Sven Böhme - empirica
boehme at empirica-institut.de
Mon Mar 25 02:26:25 PDT 2019
-----Ursprüngliche Nachricht-----
Von: Sven Böhme - empirica
Gesendet: Montag, 25. März 2019 10:25
An: 'Stefan Giese (WhereGroup)' <stefan.giese at wheregroup.com>
Betreff: AW: [Qgis-user] Aggregation of adjacent polygons of the same type
Hi Stefan,
maybe this helps to clarify the problem...
Thanks a lot
Sven
-----Ursprüngliche Nachricht-----
Von: Stefan Giese (WhereGroup) <stefan.giese at wheregroup.com>
Gesendet: Montag, 25. März 2019 10:11
An: Sven Böhme - empirica <boehme at empirica-institut.de>
Cc: qgis-user at lists.osgeo.org
Betreff: Re: [Qgis-user] Aggregation of adjacent polygons of the same type
Hi Sven,
can you specify your question: what is unclear and where exactly do you need support for?
best regards
stefan
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Am 2019-03-25 10:04, schrieb Sven Böhme - empirica:
> Hi!
>
> I'm trying to aggregate neighboring polygons based on additional
> conditions. These are:
>
> - the polygons must be adjacent
>
> - the polygons must be of the same type (simple value from attribute)
>
> - the polygons should only be combined if the values of an attribute x
> are below a certain value AND
>
> - the polygons shall be merged with other polygons until this value is
> reached
>
> The polygons are grids. Aggregation should not necessarily lead to new
> squares (as in the Quadtree-method).
>
> I use PostGIS to store the data and QGIS for visualization and further
> processing. For performance reasons I suspect that a
> database-supported procession makes sense, but if QGIS (GDAL,GRASS
> etc.) offers a function, I would like to try it out.
>
> I would be happy about support
>
> Best regards
>
> Sven
>
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