[Qgis-user] How to Create These type of Watershed Maps in QGIS

[C Hamilton]

Thanks to everyone for these ideas. It will be fun to give this a try.

Thanks,

Calvin

On Thu, Aug 6, 2020 at 8:27 PM Priv.-Doz. Dr. Maria Shinoto <
maria.shinoto at zaw.uni-heidelberg.de> wrote:

> 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 <adenaculture at 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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