[GRASS-user] r.basins.fill usage

[M S]

Based on this excerpt from the manual, it seems the main
external/perimeter watershed boundary, as well as the internal ridges
need inputted?  "The raster map layer depicting ridges should include
the ridge which defines the perimeter of the watershed. The coded
stream network can be generated as part of the r.watershed program,
but the map layer of ridges will need to be created by hand"

My question is really about the need to manually digitize ridges
inside the watershed boundary delineated by r.watershed.  As opposed
to running r.watershed with a smaller threshold to get these smaller
basin delineations within a given study area.

If one has to manually digitize the internal ridges in a watershed, I
wondered what the point of the module was.  It obviously has
application, but it seems I am missing something obvious.

Hope that is more clear.

Thanks for the correspondence,
Mark

On Thu, Oct 15, 2009 at 11:21 AM, Achim Kisseler
<ak7 at jupiter.uni-freiburg.de> wrote:
>> The man page seems to imply that internal divided need digitized?
>
> Sorry, again I didn't get the point. Can you explain a bit more
> detailed, please?
>
> Achim
>
>