On 16/05/13 14:10, BLANDENIER Lucien wrote:
Dear all,
I'm trying to merge all polygones with the same attribut of a shapefile. I saw
it is possible to merge adjacent polygone with r.dissolve but I didn't found
how to do this with polygones that are not adjacent. Is there a way to do this?
My goal is to minimise the number of feature into my table in order to have
only one feature by category, but containing several polygones.
If your common attribute is of type integer or string, it's actually
quite simple:
v.reclass YourMap output=NewMap col=CommonAttributeColumn
then
v.to.db or v.rast.stats will give you aggregate values per category,
i.e. across all polygons that share the same attribute.
Moritz
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