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I am trying to calculate the distance between the green points and the red point on their left and add that distance to the green points attributes.

The lines are roads and I made the red dots using the QChainage extension. I then added the roads ID to the red dots. After that I tried to calculate the distance using the Distance Matrix but the results weren't the one I expected.

Is there another way I could get the distance between the points and the point to their left?

enter image description here

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  • Do the green dots have an attribute field to identify the target red dot?
    – Kazuhito
    Jun 24, 2020 at 10:30
  • Yes, they have a unique ID in common Jun 24, 2020 at 12:27

1 Answer 1

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Some assumptions:

  • Red: The layername of the red points
  • id: The unique id field in the Red layer.
  • Green: The layername of the green points
  • red_id: An identifier which suggests the point in Red layer. This corresponds to id in the Red layer.

Workflow:

  1. Open attribute table of the Green layer and start the Field Calculator.
  2. Create a new field dist (or something like that) with an expression distance($geometry, geometry(get_feature('Red', 'id', "red_id")))

Hope this helps. Please modify the attribute names as required.

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  • Thank you very much, it worked! I will just need to fix a few things with my red dots and I will have the results I needed Jun 24, 2020 at 14:38

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