2

enter image description here

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?

Taras
  • 32,823
  • 4
  • 66
  • 137
Geo_it
  • 493
  • 2
  • 10

1 Answers1

3

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

enter image description here

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.

Ian Turton
  • 81,417
  • 6
  • 84
  • 185
  • Thank you. I followed your tip but I cannot change the method. It remains on "colour". I added a screenshot. – Geo_it Mar 08 '20 at 17:39
  • It should work with 3.4 but I would upgrade to 3.10 to be sure – Ian Turton Mar 08 '20 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 '22 at 09:52
  • 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. https://gis.stackexchange.com/questions/45243/how-to-determine-the-centroid-of-polygons – esperluette Mar 06 '23 at 15:04