[Qgis-user] WG: Aggregation of adjacent polygons of the same type

[Sven Böhme - empirica]

-Ursprüngliche Nachricht-
Von: Sven Böhme - empirica 
Gesendet: Montag, 25. März 2019 10:25
An: 'Stefan Giese (WhereGroup)' 
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) 
Gesendet: Montag, 25. März 2019 10:11
An: Sven Böhme - empirica 
Cc: qgis-user@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
> 
> 
> 
> empirica ag
> 
> Sven Böhme
> 
> Kaiserstraße 29
> 
> 53113 Bonn
> Fon +49 (0)228 91489-90
> 
> Fax +49 (0)3222 95 66 169
> 
> www.empirica-institut.de [1]
> 
> empirica ag - Zweigniederlassung Bonn - HRB 87951 Amtsgericht 
> Charlottenburg
> 
> Vorstand: Dr. Marie-Therese Krings-Heckemeier (Vorsitzende),
> 
> Ludger Baba, Dr. Reiner Braun (stellv. Vors.), Meike Heckenroth, Prof.
> Dr. Harald Simons
> 
> Aufsichtsratsvorsitzender: Klaus Arndt
> 
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[Qgis-user] Aggregation of adjacent polygons of the same type

[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



empirica ag
Sven Böhme
Kaiserstraße 29
53113 Bonn
Fon +49 (0)228 91489-90
Fax +49 (0)3222 95 66 169
www.empirica-institut.de

empirica ag - Zweigniederlassung Bonn - HRB 87951 Amtsgericht Charlottenburg
Vorstand: Dr. Marie-Therese Krings-Heckemeier (Vorsitzende),
Ludger Baba, Dr. Reiner Braun (stellv. Vors.), Meike Heckenroth, Prof. Dr. 
Harald Simons
Aufsichtsratsvorsitzender: Klaus Arndt

Kostenloser Newsletter von empirica. Jetzt anmelden:
https://www.empirica-institut.de/newsletter-anmelden/
Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. 
Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten 
haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. 
Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht 
gestattet. - This e-mail may contain confidential and/or privileged 
information. If you are not the intended recipient (or have received this 
e-mail in error) please notify the sender immediately and destroy this e-mail. 
Any unauthorized copying, disclosure or distribution of the material in this 
e-mail is strictly forbidden.

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