[GRASS-user] create basins of similar area

[Ken Mankoff]

Maybe make basins with threshold an order of magnitude smaller. Then merge
small areas to get your 4-5 km2 areas. Still not totally sure how this
makes sense hydrologically.

  -k.

Please excuse brevity. Sent from tiny pocket computer with non-haptic
feedback keyboard.

On Thu, Apr 25, 2019, 16:05 Markus Metz <markus.metz.giswork at gmail.com>
wrote:

>
>
> On Thu, Apr 25, 2019 at 5:34 PM Moritz Lennert <
> mlennert at club.worldonline.be> wrote:
> >
> >
> >
> > Am 25. April 2019 17:29:24 MESZ schrieb Martin Landa <
> landa.martin at gmail.com>:
> > >Hi,
> > >
> > >čt 25. 4. 2019 v 17:19 odesílatel Francois Chartier
> > ><fra.chartier at gmail.com> napsal:
> > >> Use r.wathershed or r.basins.
> > >
> > >well, I know these tools. I am just not sure how to control optimal
> > >basin area (eg. 4-5km2). I just found `threshold` parameter.
> > >
> >
> >
> > I don't really see how a homogeneous size could actually make sense. The
> threshold allows you to define a minimum size, but depending on the actual
> topography actual sizes of basins will always differ.
>
> I agree. A solution could be manual editing: merge basins by adhering
> hydrological rules (merge a downstream basin with an upstream basin granted
> that other upstream basins do not become isolated). But hydrologically this
> does not make sense, compare with stream order numbers.
>
> Markus M
>
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