7

I'm using QGIS 3.16 Hannover under MacOS 10.13 environment. I've got two polygon shapefile layers: 'LIC' and 'ZEPA'. Some polygons (name, code & geometry) are present in both layers and I want to identify them by adding a new field to the layer 'ZEPA' with the value "yes" if that feature is also present in the other layer. I've tried in the field calculator the function overlay_equals(). My try has been

    array_to_string(overlay_equals('LIC', "yes"))

But it returns the new field empty (instead of "yes") for those equal features. What is wrong?

2
  • Did you also try 'yes'? – Matthias Kuhn Feb 28 at 15:55
  • I did, but it returns NULL for all features. – Jesús Pinilla Feb 28 at 15:57
5

The following code actually does what I want

CASE WHEN overlay_equals('LIC') = 1
THEN 'yes'
ELSE NULL
END

Another option could be obtaining a 0/1 return, setting an integer field with the following expression:

overlay_equals('LIC')

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