[Qgis-user] What is the best way to do a simple watershed analysis on a raster grid?

[G. Allegri]

You can also use GRASS commands dedicated to hydrological analysis, like
r.watershed.
They're also available through Processing.

giovanni


2013/11/27 kimaidou <kimaidou at gmail.com>

> Thanks a lot for the kind anwsers. I will try these tutorials !
>
> Cheers
> Michael
>
>
> 2013/11/27 Lene Fischer <lfi at ign.ku.dk>
>
>>  Hi Michael,
>> Try this cookbook
>> http://qgissextante.blogspot.dk/2013/01/hydrology-analysis-with-taudem.html
>>
>>  Regards
>> Lene Fischer
>>  ------------------------------
>> *From:* qgis-user-bounces at lists.osgeo.org [
>> qgis-user-bounces at lists.osgeo.org] on behalf of kimaidou [
>> kimaidou at gmail.com]
>> *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 <alexander.bruy at gmail.com>
>>
>>> 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 <rstewart at hydrologyandwater.com.au>:
>>>  > 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
>>> >
>>> >
>>>  > _______________________________________________
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>>>
>>>
>>>
>>> --
>>> Alexander Bruy
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>
>>
>>
>>
>
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-- 
Giovanni Allegri
http://about.me/giovanniallegri
blog: http://blog.spaziogis.it
GEO+ geomatica in Italia http://bit.ly/GEOplus
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