You can also use GRASS commands dedicated to hydrological analysis, like r.watershed. They're also available through Processing.
giovanni 2013/11/27 kimaidou <[email protected]> > Thanks a lot for the kind anwsers. I will try these tutorials ! > > Cheers > Michael > > > 2013/11/27 Lene Fischer <[email protected]> > >> Hi Michael, >> Try this cookbook >> http://qgissextante.blogspot.dk/2013/01/hydrology-analysis-with-taudem.html >> >> Regards >> Lene Fischer >> ------------------------------ >> *From:* [email protected] [ >> [email protected]] on behalf of kimaidou [ >> [email protected]] >> *Sent:* 26 November 2013 20:43 >> *To:* Alexander Bruy >> *Cc:* qgis-user >> *Subject:* Re: [Qgis-user] What is the best way to do a simple watershed >> analysis on a raster grid? >> >> Hi >> >> 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. >> 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. >> 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") >> >> Michael >> >> >> 2013/11/25 Alexander Bruy <[email protected]> >> >>> Hi Rob, >>> >>> you can try to do this with Processing framework. There is >>> at least three different providers that have watershed analysis >>> tools: GRASS, SAGA and TauDEM >>> >>> 2013/11/24 Rob Stewart <[email protected]>: >>> > Hi, >>> > What's the best way to do a simple watershed analysis on a raster >>> grid? I'm >>> > wanting to generate rainfall/runoff sub-catchment polygons. >>> > Rob >>> > >>> > >>> > _______________________________________________ >>> > Qgis-user mailing list >>> > [email protected] >>> > http://lists.osgeo.org/mailman/listinfo/qgis-user >>> >>> >>> >>> -- >>> Alexander Bruy >>> _______________________________________________ >>> Qgis-user mailing list >>> [email protected] >>> http://lists.osgeo.org/mailman/listinfo/qgis-user >>> >> >> >> > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > -- Giovanni Allegri http://about.me/giovanniallegri blog: http://blog.spaziogis.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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