Bug report #16115

different (wrong) output of 'join attributes by location' when used in graphical modeller

Added by Pieter Brusselman over 2 years ago. Updated over 2 years ago.

Status:Closed
Priority:Normal
Assignee:Victor Olaya
Category:Processing/Modeller
Affected QGIS version:2.18.2 Regression?:No
Operating System:windows Easy fix?:No
Pull Request or Patch supplied:No Resolution:
Crashes QGIS or corrupts data:No Copied to github as #:24027

Description

It is a similar bug like #16111. When doing spatial analysis within a model it produces a wrong result. When doing it by hand it works.

The case:
I have 3 layers
- points (located along/nearby lines)
- linestrings
- polygon

1/ I make a buffer (10m) of the polygon layer
2/ I do a spatial join from points and buffered polygons (take summary of intersecting features, statistic = mean)
3/ I make a slight buffer (0,5m)of the enriched points to make sure they will overlap the corresponding line
4/ I do a spatial join from the lines with the buffered points (take summary of intersecting features, statistic = mean)

Result: all statistics have null value.

When I take the buffered points as the outcome of the model and do the spatial join with the linestrings by hand, I get the right results.


Related issues

Related to QGIS Application - Bug report #16111: different (wrong) output of bufferalgorithm when used in ... Closed 2017-01-25

History

#1 Updated by Pieter Brusselman over 2 years ago

When removing unvalid geometries (by hand or implemented in the model) then it works.

But when joining by hand (without removing unvalid geometries) there is no problem.

I think the behaviour of doing it in a model or doing it by hand should be the same.

#2 Updated by Giovanni Manghi over 2 years ago

  • Priority changed from High to Normal
  • Status changed from Open to Feedback

Please attach sample project/data.

#3 Updated by Alexander Bruy over 2 years ago

  • Status changed from Feedback to Closed

Closed for the lack of feedback. Please reopen if necessary.

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