<div dir="auto">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. <div dir="auto"><br></div><div dir="auto"> -k. <br><br><div data-smartmail="gmail_signature" dir="auto">Please excuse brevity. Sent from tiny pocket computer with non-haptic feedback keyboard. </div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 25, 2019, 16:05 Markus Metz <<a href="mailto:markus.metz.giswork@gmail.com">markus.metz.giswork@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><br>On Thu, Apr 25, 2019 at 5:34 PM Moritz Lennert <<a href="mailto:mlennert@club.worldonline.be" target="_blank" rel="noreferrer">mlennert@club.worldonline.be</a>> wrote:<br>><br>><br>><br>> Am 25. April 2019 17:29:24 MESZ schrieb Martin Landa <<a href="mailto:landa.martin@gmail.com" target="_blank" rel="noreferrer">landa.martin@gmail.com</a>>:<br>> >Hi,<br>> ><br>> >čt 25. 4. 2019 v 17:19 odesílatel Francois Chartier<br>> ><<a href="mailto:fra.chartier@gmail.com" target="_blank" rel="noreferrer">fra.chartier@gmail.com</a>> napsal:<br>> >> Use r.wathershed or r.basins.<br>> ><br>> >well, I know these tools. I am just not sure how to control optimal<br>> >basin area (eg. 4-5km2). I just found `threshold` parameter.<br>> ><br>><br>><br>> 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.<br><div><br></div><div>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.</div><div><br></div><div>Markus M<br></div><br></div>
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