[GRASS-user] Longest flow path

[Jarek Jasiewicz]

David Townshend pisze:
> Hi all
>
> Can anyone suggest a way for me to determine the longest flow path in
> a catchment? I have several hundred to do, so I'd like a way to
> automate it if possible.
>
> Regards
> David
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>   
r.watershed elevation=elev drainage=dirs streams=stream treshold=<some 
value>
r.stream.order streams=streams dirs=dirs hack=longest

the stream with order 1 will be the longest streams of the catchment

J.