Add new field in a point layer with an attribute from another layer in QGIS

Question

I'm working with QGIS 3.16 Hannover under MacOS 10.13 environment. I've got a point and a polygon shapefile layers. I want to add a new field to my point layer with the id of the polygon that contains it. Is it possible to do so with the field calculator, instead of creating a new layer?

Kadir Şahbaz · Accepted Answer

You can use refFunctions plugin. It adds custom user functions to QGIS Field Calculator. Then, you can add a new field to the point layer with the id of the polygon that contains it using the following expression in Field Calculator for the point layer:
geomwithin( 'polygon_layer_name', 'id_field_of_polygon_layer' )

Babel · Answer

There is also a possibility without need to install a plugin, simply using this expression (available since QGIS 3.16):
array_to_string (overlay_within('polygon', id))

Add the function to_int () to get an integer instead of a string as output type.

Add new field in a point layer with an attribute from another layer in QGIS

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