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I am looking for the distance of the closest point (Layer 1) to my atlas object (Layer 2). I want to use the expression builder.

Example: I have a House, which is also the atlas_feature, on 'Layer A'. I have bus stations which are on 'Layer B'. I want to get the distances to the closest Bus Station on 'Layer B'.

For getting the Name of the closest Busstation on 'Layer B' I am using reffunctions geomnearest. However, I also need the distance to the closest one.

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  • 3
    Something like that : distance($geometry, geomnearest('Busstation','$geometry')) ?
    – J. Monticolo
    Nov 20, 2020 at 16:51
  • geomnearest gives out an attribute (e.g. the name of a Busstation) so I think it cannot be used with distance like that, since the distance expression is looking for a geometry. Maybe something with the aggregate expression?
    – Corninski
    Nov 23, 2020 at 12:32
  • 1
    Look at the result of geomnearest('other_layer_name','$geometry'), it returns the geometry field / attribute of the other layer, so, geometry.
    – J. Monticolo
    Nov 23, 2020 at 13:10
  • 2
    Yes, I tried and geomnearest returns the result as a WKT (string). So, just add the function geom_from_wkt as : distance(geom_from_wkt(geomnearest('Haltestelle_KBS', '$geometry')), $geometry). It'll work.
    – J. Monticolo
    Nov 25, 2020 at 12:50
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    In a QGIS expression builder (selection or update), you have in the bottom left corner a Preview text : docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/…
    – J. Monticolo
    Nov 25, 2020 at 16:39

1 Answer 1

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I used the following:

distance(
   aggregate(
             layer:='Busstation',
             aggregate:='collect',
             expression:=$geometry
            ),
         $geometry)
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  • 1
    Maybe I misunderstand, but for me it's unnecessary complex.
    – J. Monticolo
    Nov 23, 2020 at 14:56

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