[GRASS-user] Hidrological network

[Hamish]

André wrote:
> I Have a vector layer with all the rivers, and 
> subsidiaries up to the smallest water lines.
> However I need to simplify this layer in order that
> it only shows the main rivers and first, second and
> third order tributary water lines.
>
> Any hints on how to achieve this?

try the v.strahler addon module:

http://grass.osgeo.org/wiki/GRASS_AddOns#v.strahler


Hamish