[GRASS5] distance to watershed algorithm?

[Markus Neteler]

Hi again,

for a friend I am searching for a distance-to-watershed
algorithm (to convince him about GRASS). He needs to
calculate the nearest distance from each *cell* in the
watershed to the watershed boundary along the elevation
surface.

Does anyone already have such a module/script available?
I have a rough idea for a script, but don't want to 
re-invent the wheel.

Thanks in advance

 Markus

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