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

2019-03-25 Thread Stefan Giese (WhereGroup) 

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

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53113 Bonn
Fon +49 (0)228 91489-90

Fax +49 (0)3222 95 66 169

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

2019-03-25 Thread 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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