[GRASS-user] How to get adjacent areas

[Hamish]

Moritz Lennert wrote:
> 
> > v.to.db option=sides
> 
> If I understand correctly this only works for boundaries, not for 
> areas/centroids.
> 
> So (again IIUC), to get a list of neighbors of an area you would have
> to:
> 
> - attribute a category value to each boundary
> - use v.to.db option=sides to get the areas adjacent to each boundary
> - for each area:
> 	- search the boundaries to which this area is adjacent
> 	- search the other areas adjacent to these boundaries

Correct.

> Might be worth looking into how difficult it would be to apply the 
> 'sides' option to centroids and find adjacent centroids...

but there may be any number of results. for boundary there are at most
two sides (2 columns to fill).


Hamish