[GRASSLIST:3192] r.terraflow

Massimiliano Cannata massimiliano.cannata at supsi.ch
Fri Apr 16 09:26:33 EDT 2004

Hello users and Laura,
I'm trying to use the GRASS command r.terraflow to get flow direction 
and flow accumulation, graphically it seems to do a great work, 
comparing to r.watershed but how do I read the maps?

    * running the command with or without the flag -s (with SFD or MFD)
      the produced map is the same (no difference with r.mapcalc)... is
      it correct?
    * the value are in the range 0-255, does it indicate the direction
      of the slopest path? why it is in 256 values and not in 360
      degrees? How to compute degrees?
    * how flow accumulation is computed?

Thanks a lot.

note: change my e-mail reference to massimiliano.cannata at supsi.ch
      because the old one will be deleted soon.
Ing.  Massimiliano Cannata
Istituto di Scienze della Terra - SUPSI
C.P. 72 - CH-6952 Canobbio (Ticino, Switzerland)
Tel +41 91 /935 12 25 - Fax +41 91 /935 12 09
eMail: massimiliano.cannata at supsi.ch
Internet: http://www.ist.supsi.ch

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