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I have a huge river network on my hands (see screen capture below), and would like to style its vector lines to get tapered rivers.

Some tutorials out there explain how to taper rivers (see links below), but they only deal with single albeit complex rivers. I have the river network for an entire landmass to deal with, and can't see myself dealing with each river network on its own.

So far, applying the techniques described in the tutorials below has not led to anything but failure: the rivers remain untapered.

My question would therefore be, can tapered rivers be created for multiple large river networks?

Tapered rivers tutorial sample:

Better river styles with tapered lines https://anitagraser.com/2017/04/17/better-river-styles-with-tapered-lines/

Improved tapered rivers in QGIS https://mirrodriguezlombardo.com/rios-afilados-qgis-en.html

Style rivers with tapered lines using QGIS https://youtu.be/BHPrlhsVtvw

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    Are you saying you have multiple layers? Can you merge them?
    – Bera
    Commented Aug 3, 2022 at 8:48
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    Do rivers have an attribute that can be used for line width?
    – Babel
    Commented Aug 3, 2022 at 9:58
  • I only have one vector layer (see added screen capture above) for the rivers. I derived them from a raster layer via "GRASS r.to.vect". I can also successfuly apply the Vector Geoprocessing tool "Dissolve" to that vector layer. But in the end, I can't get anything tapered ... because, it seems, of the incredible large number of river networks I have to work with.
    – CyanideBaby
    Commented Aug 3, 2022 at 10:35
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    If you dissolved it have you turned it into one big multiline feature? Maybe that is why it doesnt work. Split it at the intersections
    – Bera
    Commented Aug 3, 2022 at 10:47
  • Sorry. Are you suggesting that the river network should be made of individual vector lines, or that it shouldn't? See screen capture above: before the "Dissolved" tool has been applied, I can select single river branches. Once the "Dissolve" tool has been applied, all rivers are considered to be a single vector.
    – CyanideBaby
    Commented Aug 3, 2022 at 11:08

2 Answers 2

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I know this is a QGIS question but I thought if anyone was looking to achieve the same affect in ArcPro then there is a very interesting blog here that manipulates a polyline symbology.

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    Excellent little tutorial. Thank you.
    – CyanideBaby
    Commented Apr 18 at 11:30
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Answer : I never managed to taper my rivers automatically within QGIS. I ended up doing it all by hand inside of a vector programme (in my case Affinity Designer, although Illustrator and Inkscape would have worked very well as well, better actually). I reduced the number of rivers I had to work with and went through the pain of manipulating them one by one inside of Aff Designer. And I only tapered the biggest rivers – see the screen capture of a portion of the landmass below.

enter image description here

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