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I have a plate of contour lines made on AutoCAD (contour lines do not have a Z). The Z is indicated only for some curves but in a text format. If you import the table in QGIS the situation is this (the points correspond to where the Z is indicated):

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My question is: knowing that the contour lines shown are every 20 meters is there a way to automatically assign the right value to each curve having only this little information? I thought about merging attributes between the layer of the contourlines and the text layer, but this would solve the situation for only a few curves.

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    Well, let me state it this way: No. This is tedious, manual work. I suggest you go back another step and think about creating the contour line in QGIS right away, ideally by automated conversion based on a DEM.
    – Erik
    Nov 27, 2020 at 13:15
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    Have you seen this thread gis.stackexchange.com/questions/199479/… ?
    – Taras
    Nov 27, 2020 at 13:17
  • @Erik Unfortunately, these contour lines were taken from an Iranian relief. They are boards from I don't know how many years ago and I don't think that by downloading a DEM from the internet I would be able to get the same result, but I don't think I have any other option left...
    – ddomizia
    Nov 27, 2020 at 13:18
  • @Taras No i hadn't seen this solution! thanks for pointing it out to me, now I'll try and see if it's right for me
    – ddomizia
    Nov 27, 2020 at 13:21

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