[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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Stefan Giese

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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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