[Qgis-user] Extraction of hydrographic network from DEM --SRTM--LANDSAT8--ASTER OPTICAL

[Nicolas Cadieux]

Hi,

Google for Saga and water basin or Chanel.  You will find tutorials. SRTM have some vector water masks that you can download from NASA. The scale may be good enough for you but smaller streams and lake will not be found, so as anything north and south of 60 degrees.  As for doing is yourself with optical images, perhaps the semi automatic classification plugin?  This will be the most difficult approach if you don’t know what you are doing. That’s why people have PHD’s in RS!

Nicolas

> Le 2 juin 2019 à 09:34, jean Lukusa <lukusam at gmail.com> a écrit :
> 
> Hi all!
> I would  like  to  know  how  hydrographic  network  shapefiles  can  be  extracted  from DEM ,SRTM, Landsat 8 and OPTICAL ASTER  using  Qgis3.6.3
> 
> Exploration  Geologist 
> +243 812156128(wattsap,imo)
> +243 973741744 
> +243 840367401
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