[GRASS-user] segmented operations in r.drain and r.los

[ALT SHN]

Hi,

I suppose one can have what I call "segmented operations" with certain
GRASS modules, for example:

- In *r.drain* I want make sure that certain points of the raster are
mandatory stops; I know I can run r.cost multiple times (a to b; b to c;
and so on). My question is how can I do it in a single command? Using the
GRASS shell, I suppose - can someone give me a example?

- the same question applies to r.los - can I calculate several visible
areas with a single command?

Thanks for any hints!

Regards,

André

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