I have a project with multiple layers. The purple dots are from a pointfile with the symbology-expression: z($geometry)> '14.5'. (so it only displays a purple dot when the Z-value is more than 14.5m).

I have a second layer with polygons, visible as the partly-transparent arc-area in red.

The next step i want to make in my project is to: have the purple dots appear only if: z($geometry)>'14.5' AND the x-y of that spot is within the geographical extent of the polygon from the second layer

What step do i have to take to get this done.

example without last step

1 Answer 1


Your question is very similar to what I've done here recently.

I used expression:


In your case step 1: filter data table by

z($geometry)> '14.5'

step 2: paste expression in point symbology layer (see gif to find where)


You can use the same expression for labels but must change 1 and 0 values to "label_field_name" and to null.

That's it.

enter image description here

  • Good answer! Would it work to drop the if-part completely and just use within(...)? Commented Mar 2, 2019 at 23:41
  • Nope it wouldn't.
    – Dan
    Commented Mar 3, 2019 at 5:28
  • That's surprising... Did you try? Commented Mar 3, 2019 at 7:04
  • Is it possible that this doesn' t work in rule-based symbology? I can get it work in a test environment, but not in my project. I used if( within($geometry,geometry(get_feature('bronpolygonen_4a087198_dafa_4185_a358_d410ed1a980e','TYPECTRL','MONITOR HOOFD VERLICHT'))), 1, 0 ) Commented Mar 4, 2019 at 16:54
  • Or is it possible that my dataset is just to big (626000 features)? Commented Mar 4, 2019 at 17:29

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