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I have a vector layer (line features) which consists of different pipes. In the attribute data I have fields that indicate the upstream elevation and downstream elevation values.

I am trying to visually depict the flow direction in these pipes using arrows based on the upstream and downstream elevation values. I cannot seem to work out a method in QGIS. Is anyone here able to assist?

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    Have you checked this link: gis.stackexchange.com/questions/67398/…
    – Shiko
    Dec 2 '16 at 1:32
  • @PolyGeo I have a potential answer for the case when its too long to change the directions of all vectors, and I would like to post it. Could you please re-open the question? Or should I just answer the linked duplicate?
    – Victor
    Dec 2 '16 at 10:55
  • @Victor wouldn't that answer apply just as well to the duplicate? That question is open for more answers.
    – PolyGeo
    Dec 2 '16 at 10:57

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