[GRASS-user] Merging Boundaries and Centroids

Micha Silver micha at arava.co.il
Fri Mar 20 06:53:46 EDT 2009

Hi Moritz:
Thanks for the corrections.

Moritz Lennert wrote:
>> You can do this with v.patch, *provided* that both vectors have 
>> equivalent attribute table columns.
> If you can use the append flag (-a) you don't need to have matching 
> tables. Just v.patch -a input=LayerA output=LayerB.
> From the man page:
> columns=name
>     Column definition in SQL style (points mode)
> So, not possible for lines/areas. I guess this is due to the more 
> complicated file format for lines and areas which makes it difficult 
> to integrate attributes.
> Moritz

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