[GRASS-user] r.watershed: Problems Using

Jarek Jasiewicz jarekj at amu.edu.pl
Wed Feb 10 13:37:47 EST 2010


Rich Shepard pisze:
> On Wed, 10 Feb 2010, Jarek Jasiewicz wrote:
>
>> it is the size (in cells number) of flow accumulation when r.watershed
>> starts delineate streams
>
> Jarek,
>
>   Now that I have a successful run I'd like to learn how to interpret the
> output maps. For examples, the accumulation map is a solid rectangle 
> of color
> and the stream output has scattered short line segments, 
???
> and the visual is a
> bunch of color. I've read the descriptions on the man page but still have
> not grasped how to interpret the results in terms of what they tell me 
> about
> the area modeled.

>
>   Pointers and suggestions greatly appreciated.
>
> TIA,
>
Sorry but I cannot understand you. What type of help you expect?
you have problems interpret results of basic hydrological modeling? , or 
rather result you received are far from expected.
in  general r.watershed with basic parameters do not nothing what do not 
other hydrological modeling tools like taudem, saga, TAS, TNT watershed, 
and others. So please be precise what is your problem. If the first 
(hope not) I suggest rather some manulas at the begining 
(www.geomorphometry.org) if the second try to explain differences.
> Rich
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