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I have recently switched from QGIS 2.18.21 to QGIS 3.0, and as of today, to the shiny new QGIS 3.2.0.

I need to do some spatial joining so I was quite surprised to find out that in QGIS3, it seems, it is no longer a possibility to summarise attributes from the joined layer. The take summaries of intersecting features is just gone. As a result I am left with joined layers, where the input layer was a polygon shapefile and join layer point shapefile, but the point attribute data is not transferred to the joined layer, and joined layer attribute table is shown as empty.

Am I missing something here?

Andre Silva
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Vesanen
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    Try Join attributes by location (Summary) in the Processing Toolbox - Vector general. – Kazuhito Jun 27 '18 at 14:51
  • Thank you Kazuhito for this answer. I was not aware of the functionality in the toolbox. – Vesanen Jun 29 '18 at 13:59
  • Thanks, glad if it worked for you. It is quite unfortunate this function is not currently accessible from Vector menu. – Kazuhito Jun 29 '18 at 14:06
  • I was looking for the same tool. I'm glad I found it in the toolbox. But I wonder why it ist not possible to adjust the precision. Especially when I'm using the "within" argument it is necessary to set a precision. Does anyone know how to do this in QGIS 3.2.1? – anikatietze Aug 15 '18 at 13:29
  • Have you had any success with the Join attributes by location (Summary) tool? In my case it executes successfully but does not join anything. When using the Join attributes by location I get the expected result. – jmbouffard Sep 21 '18 at 19:03
  • @jmbouffard did you have any luck with getting the tool to join? I am having the same issue. – AWGIS Nov 05 '18 at 11:58
  • @Kazuhito It is better to add your comment as an answer. It will reduce the number of unanswered questions :) – ahmadhanb Nov 20 '18 at 06:21
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    Thanks @ahmadhanb Will do... ... I now see other comments. Will try to check these points and post an answer. – Kazuhito Nov 20 '18 at 10:24

1 Answers1

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Try Join attributes by location (Summary) tool, which can be found in the Processing Toolbox Vector general group.

Some additional comments:

  1. As of QGIS 3.4.1, this tool is only accessible from the Processing Toolbox. From the menu Vector | Data Management Tools only Join attributes by location tool can be activated.
  2. As of QGIS 3.4.1, Precision option is not available (see the comment by anikatietze. To set the precision we need to use QGIS 2.18.
  3. Sometimes we may see "blank" output using this tool (see comments by jmbouffard and AWGIS ). As far as I have tested, this occurs when we unuse both Fields to summarise and Summaries to calculate options. When we have many attribute fields, keeping these two options empty means that QGIS has to output tremendous number of combinations of statistics, and it fails (or, it takes a long time to show the attribute table). You can select one of options to help QGIS. Perhaps you do not need all these statistical outputs calculated at once.
Kazuhito
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