[Qgis-user] river network to basin: external boundary

[Agustin Lobo]

Hi!
how could I get a polygon to approach the river basin from a river network?
Is this something that could be
done with fTools? (note: the convex hull is not the solution, as the basin
is not convex)

see figure here
http://sites.google.com/site/eospansite/dummy/rnetwork.jpg

Thanks

Agus
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