Sorry, just an addendum, 

for creating these watershed maps, you need a DEM, older satellite data should 
suffice for larger maps. I was working on a small scale (16 km2) with a 5m DTM. 

The process is the same: use WangLiu algorithm in the processing toolbox (SAGA 
tools) to fill sinks, then calculate Strahler order (SAGA tools), set a 
threshold for the start of a "stream", then define a point for the upstream 
area. You can vectorize the area and then style the streams (great with the 
order value, you can set the width of the streams) and the drainage basins. 

I am still impressed, it is so helpful and easy. You can do the same with GRASS 
tools as well, although some steps vary a bit. 

Good luck, 
Maria




Hi, 

I just created one yesterday with the book of Hans van der Kwast. So easy! 
(when you are told what to do...)

He has a YouTube channel where you can follow these instructions as well. 

Best,
Maria

> Am 07.08.2020 um 07:13 schrieb C Hamilton <adenacult...@gmail.com>:
> 
> I was wondering if anyone had any idea on how one would go about creating 
> these types of maps in QGIS.
> 
> https://www.visualcapitalist.com/maps-worlds-watersheds/ 
> 
> Assume the watershed polygons are available as well as the river data.
> 
> Anyway I think these pictures are stunning.
> 
> Thanks,
> 
> Calvin
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