QGIS: use geometry from different layer in symbology expression












2















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






qgis symbology z-value







share|improve this question





























    2















    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






    qgis symbology z-value







    share|improve this question



























      2












      2








      2








      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






      qgis symbology z-value







      share|improve this question
















      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






      qgis symbology z-value




      qgis symbology z-value






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 3 hours ago









      Matthias Kuhn

      18.9k14890




      18.9k14890










      asked 3 hours ago









      CaptainAhabCaptainAhab

      656




      656






















          1 Answer
          1






          active

          oldest

          votes


















          2














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



          I used expression: 



          if(
          
within($geometry,geometry(get_feature(layer,attribute,value))),
          
result_when_true,
          
result_when_false
          
)


          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)



          if(
          
within($geometry,geometry(get_feature('your_polygon_layer_name','the_layers_field','feature_data'))),
          
1,
          
0
          
)


          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






          share|improve this answer


























          • Good answer! Would it work to drop the if-part completely and just use within(...)?

            – Matthias Kuhn
            54 mins ago











          Your Answer








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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














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



          I used expression: 



          if(
          
within($geometry,geometry(get_feature(layer,attribute,value))),
          
result_when_true,
          
result_when_false
          
)


          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)



          if(
          
within($geometry,geometry(get_feature('your_polygon_layer_name','the_layers_field','feature_data'))),
          
1,
          
0
          
)


          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






          share|improve this answer


























          • Good answer! Would it work to drop the if-part completely and just use within(...)?

            – Matthias Kuhn
            54 mins ago
















          2














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



          I used expression: 



          if(
          
within($geometry,geometry(get_feature(layer,attribute,value))),
          
result_when_true,
          
result_when_false
          
)


          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)



          if(
          
within($geometry,geometry(get_feature('your_polygon_layer_name','the_layers_field','feature_data'))),
          
1,
          
0
          
)


          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






          share|improve this answer


























          • Good answer! Would it work to drop the if-part completely and just use within(...)?

            – Matthias Kuhn
            54 mins ago














          2












          2








          2







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



          I used expression: 



          if(
          
within($geometry,geometry(get_feature(layer,attribute,value))),
          
result_when_true,
          
result_when_false
          
)


          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)



          if(
          
within($geometry,geometry(get_feature('your_polygon_layer_name','the_layers_field','feature_data'))),
          
1,
          
0
          
)


          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






          share|improve this answer















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



          I used expression: 



          if(
          
within($geometry,geometry(get_feature(layer,attribute,value))),
          
result_when_true,
          
result_when_false
          
)


          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)



          if(
          
within($geometry,geometry(get_feature('your_polygon_layer_name','the_layers_field','feature_data'))),
          
1,
          
0
          
)


          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







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 1 hour ago

























          answered 2 hours ago









          VitruviusVitruvius

          429210




          429210













          • Good answer! Would it work to drop the if-part completely and just use within(...)?

            – Matthias Kuhn
            54 mins ago



















          • Good answer! Would it work to drop the if-part completely and just use within(...)?

            – Matthias Kuhn
            54 mins ago

















          Good answer! Would it work to drop the if-part completely and just use within(...)?

          – Matthias Kuhn
          54 mins ago





          Good answer! Would it work to drop the if-part completely and just use within(...)?

          – Matthias Kuhn
          54 mins ago


















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