[Qgis-user] Merge adjacent polygons based on attribute condition?

[celati Laurent]

Dear all,
I work with Qgis, I have a polygon layer of 4,000 objects. A 'hierarchy'
field provides information on the confidence level: 1, 2A, 2B, 3A, 3B.
Of these 4,000 polygons, 3,000 are actually small polygons less than 500 m².
 For these small polygons, I'd like to be able to merge them with one of
their neighboring polygons, ideally, the one with the closest "hierarchy"
value.
 If not possible to do that, with the one with the lowest "hierarchy" value.
 Among these 3,000 polygons, some have no neighbors.
They are isolated. For these, the idea would be to find a way to first
select them and then delete them. Does anyone think they can help?
How can I ideally do this with QGIS or PostGIS?
Thanks so much.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20250818/6d3284b2/attachment.htm>