Rich Shepard pisze:
On Tue, 3 Aug 2010, Jarek Jasiewicz wrote:
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
Jarek,
Please correct me if I'm wrong, but I don't believe this answers
David's
question.
yes this is correct answer. I suggest hack ordering not horton or
strahler. Hack ordering ascribe first order to the longest stream in the
catchement, second order to its tributaries etc. see more in documentation.
If you need more options also you can use:
r.stream.order streams=streams dirs=dirs hack=longest table=ordering
it will create table which has several attributes including longest
length from head (cumlength) for every segment and distance to outlet
(distance) where all segments has its more downstream cell distance to
the outlet. Also see documentation.
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