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I have a layer of line objects representing stream channels. These have been generated at 50K scale but do not have a Strahler order designation. The tutorials I've seen using the SAGA extension in QGIS all start at converting a DEM. I don't need this step. Is it possible to produce Strahler order on a vector layer of connected lines?

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A few years ago I wrote a QGIS plugin named Strahler which achieves precisely what you're looking for. Unfortunately it is only compatible with QGIS 2.* because I stopped its maintenance. It might be useful for you though.

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    Is there anything that would induce you to update your plugin to work with 3.x? I loved your work with 2.18, but I don't have that installed at work anymore.
    – Johanna
    Commented Jul 14, 2021 at 3:38
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Have you checked the SAGA GIS order strahler module? I have tried it and it seems efficient, but it does not generate the vectorial layer

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you have probably already solved this problem, but I will leave a link here in case colleagues with a similar problem come across this discussion

There is a plugin for QGIS, which allows you to calculate attributes on a vector layer - lines ranking https://linesranking.readthedocs.io/en/latest/

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