[GRASSLIST:5638] r.flow and flowpath length

[marco castrogiovanni]

hi,
I'm currently building up an hydrologic model based on raindrop method.
I need to calculate the lengths of flowlines. I've tried with r.flow by
the following syntax:

r.flow -3 elevin=bas.dem aspin=bas.asp flout= bas.flow lgout=bas.len

where bas.dem is a raster map (filled with r.fill.dir) with resolution
of 1920x2100 cells, with cell-dimensions 20x20 meters and with high
precision quota value (six decimal numbers).
I haven't obtained any acceptable results yet, 'cause all flowlines
suddenly stop in unexpected points and they don't reach the outlet.
Raster map of distances from outlet that I get after running r.flow
have a lot of zero-value cells, but their corresponding quota and 
aspect value wouldn't allow these results.
Any suggestions would be appreciated.

Regards, Marco.




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