[GRASS-user] intersection of network-lines and areas

Markus Metz markus.metz.giswork at googlemail.com
Mon Mar 2 10:09:03 EST 2009

achim wrote:
> I have many rivers flow into sinks. 
Sounds like r.terraflow output.
> So I have to define the points, where the river-network has its extreme
> points/where the points with highest accumulation-values are.
In case of r.watershed, the stream segment output is more precise.
> I understand, that I need only one point for r.water.outlet:
> -> how do I find out the E and N of the starting-cell? Its a CELL and
> there are falling many coordinates within.
Any set of coordinates falling within that cell should do.
BTW,  r.terraflow flow direction must be modified before it can be used 
with r.water.outlet.
> -> how do I give r.water.outlet a list of my desired "starting-cells"
> (their coordinates)
You could call r.water.outlet repeatedly in a script.

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