[Qgis-user] Generating rivers from DEM

[Nicolas Cadieux]

Hi,

The first thing to do is to fill sink algorithm. Most importantly, do NOT save this output as a tiff.  Just leave it as a temporary file. This way, It will keep the SAGA format.

Then use this temporary layer to make the bassins and river channels. It  looks like there is a bug when saving the sink free raster as a tiff.  Results are very different in the bassin file.  If you can reproduce, tell me.  We should do a bug report.

Nicolas

> Le 26 nov. 2018 à 05:48, <jillb at south-gis.co.za> <jillb at south-gis.co.za> a écrit :
> 
> Hi all.
>  
> I’m trying to generate rivers from SRTM data in Cameroon.
>  
> I’ve done a few tests using the SAGA tools – Channel Network and Channel Network and Drainage Basins.  However, I’m not getting any useable answers out.  I’m not sure if my parameters are incorrect or what.
>  
> The size of the area I am trying to generate rivers for is 110km x 110km (One SRTM scene).
>  
> I am on the latest version of QGIS – 3.4.1.
>  
> Many thanks
> Jill
> 
> 
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