[GRASS-user] Merge polygone with same attribut of a shapefile

[Vincent Bain]

Hello Lucien,

I'm not sure whether your idea is to simplify an attribute table (by
deleting rows), or to perform a geometrical dissolution on polygons. For
an actual merging of adjacent polygons (removal of common boundaries)
then use v.dissolve. Else, be aware that several objects can share the
same category, consequently several objects can have a common
corresponding record within a linked table (I guess it is what you
want).

In the latter case I suggest you to have a glance at these pages :

http://grass.osgeo.org/grass64/manuals/vectorintro.html

http://grasswiki.osgeo.org/wiki/Vector_Database_Management#Grass_vector_management_model


Hope this helps,
Vincent


Le jeudi 16 mai 2013 à 12:10 +0000, BLANDENIER Lucien a écrit :
> 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.
> 
> Regards
> 
> Lucien
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