[GRASS-user] Problem with half basins becoming fragmented using r.watershed

[Erin Hanan]

Thank you again Massi. This fixed my problem!

On Mon, Jul 16, 2018 at 10:10 PM, Massi Alvioli <nocharge at gmail.com> wrote:

> 2018-07-16 18:53 GMT+02:00 Erin Hanan <ejhanan at gmail.com>:
>
> Hi Erin,
>
> let me forward your email to the list, since this may be interesting to
> others.
>
> > Yes, this helps a lot; thank you! I've been reading through your paper
> and
> > see that you mentioned one possible solution would be to remove slope
> units
> > smaller than "cleansize", and then enlarge the adjacent slope units to
> fill
> > the missing area using the r.grow. I'm curious whether I can also achieve
> > this using r.area to remove the small half basins and then r.grow. I've
> also
> > installed your software (r.slopeunits), and am planning to experiment
> with
> > the different approaches today.
> >
> > By the way, I forgot to mention it in my original email, but yes, I tried
> > several different threshold values. Interestingly, changing the threshold
> > tended to change the size of larger half basins, but the sliver and
> > fragmented basins always remained a problem.
> >
> > Anyway, thanks again for your very helpful email!
>
> You are most welcome. Also, one of our cleaning approaches does
> exactly what you suggest:
> remove small areas and fill the empty spaces with r.grow.
>
> Let us know if you get meaningful results!
>
>
> Massi
>
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