[GRASS-user] r.terraflow

[doktoreas]

G. Allegri wrote:
> 
> Hi list.
> I'm trying to use terraflow for the very first time, because
> r.watershed is too much time consuming for my dataset. I've updated it
> to include the recent patches to categories coding.
> In the new coding scheme, when using the sdf option, 9 directions are
> depicted (0,1,2,4,8,16,32,64,128). I reclassify them to compare the
> result with r.watershed, but I'm not sure about the 0 values returned
> by r.terraflow. In r.watershed the positive values, multiplied for 45,
> give the direction angle relative to north, so 8 directions are used
> (1-8), and I've setup the following reclassifying rules:
> 
> 1=2
> 2=3
> 4=4
> 8=5
> 16=6
> 32=7
> 64=8
> 128=1
> 
> I miss the zeroes... I've given a rapid look to the source code, and I
> see it's used as "default" return value. ???
> 
> 
Hi Giovanni,
me and Ivan played some time ago with r.terraflow..you can find more info in
this topic:
http://www.nabble.com/r.watershed-and-swap-memory-to16116939.html#a16137454

Bye
Luca 
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