<div dir="ltr">You can also use GRASS commands dedicated to hydrological analysis, like r.watershed. <div>They're also available through Processing.</div><div><br></div><div>giovanni</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">2013/11/27 kimaidou <span dir="ltr"><<a href="mailto:kimaidou@gmail.com" target="_blank">kimaidou@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div><div>Thanks a lot for the kind anwsers. I will try these tutorials !<br><br></div>Cheers<br></div>Michael<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/11/27 Lene Fischer <span dir="ltr"><<a href="mailto:lfi@ign.ku.dk" target="_blank">lfi@ign.ku.dk</a>></span><br>
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<div style="direction:ltr;font-size:10pt;font-family:Arial">Hi Michael,
<div>Try this cookbook <a href="http://qgissextante.blogspot.dk/2013/01/hydrology-analysis-with-taudem.html" target="_blank">http://qgissextante.blogspot.dk/2013/01/hydrology-analysis-with-taudem.html</a></div>
<div><br>
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<div>Regards</div><span><font color="#888888">
</font></span><div><span><font color="#888888">Lene Fischer<br>
</font></span><div style="font-size:16px;font-family:Times New Roman"><span><font color="#888888">
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> <a href="mailto:qgis-user-bounces@lists.osgeo.org" target="_blank">qgis-user-bounces@lists.osgeo.org</a> [<a href="mailto:qgis-user-bounces@lists.osgeo.org" target="_blank">qgis-user-bounces@lists.osgeo.org</a>] on behalf of kimaidou [<a href="mailto:kimaidou@gmail.com" target="_blank">kimaidou@gmail.com</a>]<br>
<b>Sent:</b> 26 November 2013 20:43<br>
<b>To:</b> Alexander Bruy<br>
<b>Cc:</b> qgis-user<br>
<b>Subject:</b> Re: [Qgis-user] What is the best way to do a simple watershed analysis on a raster grid?<br>
</font><br>
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<div>
<div>
<div>Hi<br>
<br>
</div>
I already tried the saga and grass tools via Processing framework. They are really powerfull, but also really complicated in my opinion. Hard to find the correct algo, the correct treshold, necessity to manually vectorize the produced watershed raster (I have
surely missed something here...), etc.<br>
</div>
I am surely not an hydrology expert, but I am convinced that we could create a full processing model wich let humble users do the job.<br>
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Any pointers to documentation or examples would be apreciated if anyone know some (I searched "grass catchment basin" or other keywords and could not find a step by step procedure adapted to "beginners")<br>
<br>
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Michael<br>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">2013/11/25 Alexander Bruy <span dir="ltr"><<a href="mailto:alexander.bruy@gmail.com" target="_blank">alexander.bruy@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Rob,<br>
<br>
you can try to do this with Processing framework. There is<br>
at least three different providers that have watershed analysis<br>
tools: GRASS, SAGA and TauDEM<br>
<br>
2013/11/24 Rob Stewart <<a href="mailto:rstewart@hydrologyandwater.com.au" target="_blank">rstewart@hydrologyandwater.com.au</a>>:<br>
<div>
<div>> Hi,<br>
> What's the best way to do a simple watershed analysis on a raster grid? I'm<br>
> wanting to generate rainfall/runoff sub-catchment polygons.<br>
> Rob<br>
><br>
><br>
</div>
</div>
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<span><font color="#888888"><br>
<br><span class="HOEnZb"><font color="#888888">
<br>
--<br>
Alexander Bruy<br>
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