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I am working with the polygon features and I would like the values to be represented in terms of proportional symbols (points). Values range from 0 to 30.

I would like that: zero value = no circle; values equal to 1 = small circle; values equal to 2 = ..; values between 2-10 = ..; Over 10 = biggest circle. It is OK to use the same colours for the different dots. How do I do it in QGIS 3.4?

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In the layer styling panel, you first select Graduated for your type of symbolisation and then under Method you select Size instead of Color.

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You can then change the start and end size, how many classes there are and the color (and shape etc.) of the symbol to get exactly the effect you want.

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  • Thank you. I followed your tip but I cannot change the method. It remains on "colour". I added a screenshot.
    – Geo_it
    Mar 8, 2020 at 17:39
  • It should work with 3.4 but I would upgrade to 3.10 to be sure
    – Ian Turton ♦
    Mar 8, 2020 at 19:57
  • I am using 3.20 and I can't find that option where you set the method (either color or size). What gives?
    – Faustin Gashakamba
    Aug 24, 2022 at 9:52
  • The problem is that you have polygons. You have to create a layer with the centroids of those polygons and the same attributes. See how to do it from here and then follow the instructions above. gis.stackexchange.com/questions/45243/…
    – esperluette
    Mar 6 at 15:04

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