[GRASS-user] Obtaining unique nodes from a topology

Hamish hamish_b at yahoo.com
Fri Jan 15 10:08:32 EST 2010

Will wrote:
> Thanks - but what I really want is a list of unique nodes
> (i.e. where three boundaries meet, there would be one node,
> with an id) and assign this id to the relevant boundaries.
> Perhaps that isn't possible. It might be easier to do
> this in PostGIS.  I need to be able to run recursive
> queries in PostGIS to pick up connected boundaries.


have a look at 'v.build option=dump,sdump,cdump'.

there you can export the topology to stdout, etc.

it would be nice if you could write up your findings/method
into a small wiki page when you are done, there is a real lack
of PostGIS+GRASS documentation.



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