I'm trying to calculate a sample distance matrix from four points in the BNG CRS: enter image description here

Using Vector-> Analysis Tools -> Distance Matrix, I get: Input point layer is a MultiPoint layer - first convert to single points before using this algorithm

**Input point layer is a MultiPoint layer - first convert to single points before using this algorithm**

How can I get a distance matrix from my layer of many points?

  • 2
    in future please put the text of your errors in the question not a picture of the error which is much harder to read
    – Ian Turton
    Mar 19, 2019 at 12:12
  • Yup! Did both since wasn't sure what one would need to help :)
    – Newb
    Mar 19, 2019 at 16:50

1 Answer 1


The error gives also an answer: convert to single points first. This can be done with the algorithm 'Multipart to singleparts'.

You can link both algorithms in the graphical modeller: processing > graphical modeller (or ctrl + alt + m)

  • define as input 'vector layer' and set as point
  • link this with algorithm 'Multipart to singleparts'
  • link output of previous with algorithm 'distance matrix' -> define an output

![enter image description here

Now it should work in one step and can be reproduced for other layers.

  • I'm not familiar with the graphical modeler (looks super powerful though), so I tried splitting the points via the same command in the toolbox, but it wont let me: layers were not correctly generated
    – Newb
    Mar 19, 2019 at 17:00
  • UPDATE: created the workflow, but can't add it to my toolbox because *shutil.SameFileError: *
    – Newb
    Mar 19, 2019 at 17:18
  • May be this can help. It is not for Qgis 3.x but it works gis.stackexchange.com/questions/162120/… Mar 19, 2019 at 20:55
  • @Newb: I don't know what this error means. But can you share your files? So I can do some tests on it?
    – PieterB
    Mar 20, 2019 at 8:58
  • 1
    @PieterB, I solved: 'shutil.SameFileError:': QGIS didn't like having the model saved into models path directly. I needed to let it load from another directory. (Basically, QGIS doesn't want to load the model since it was in the models folder, but because it wasn't loaded through QGIS I couldn't access it through the GUI). Hope this helps someone else.
    – Newb
    Mar 20, 2019 at 12:12

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