[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

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