Bug report #20049

Snap geometries -tool cannot handle polylines with length of zero

Added by Petri Latva-Käyrä almost 2 years ago. Updated over 1 year ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Geometry
Affected QGIS version:2.18.22 Regression?:No
Operating System:Windows 10 Easy fix?:No
Pull Request or Patch supplied:No Resolution:no timely feedback
Crashes QGIS or corrupts data:No Copied to github as #:27871

Description

I encountered an issue with the Snap geometries -tool when trying to snap polylines to reference polylines. My dataset consisted of line segments for a transport networt. The network had also lines which had same start and end node. From the datasets perspective, this is not an error. However, the snap geometries -tool crashes every time when encountering such a vector. I bypassed the problem by running the Check validity -tool and snapping the geometries only for the valid lines.

I am not sure if this should be a features request or a bug report. From my perspective it is a bug. The tool should be able to handle such cases similarly as other polylines or at least bypass them in the processing without crashing.

History

#1 Updated by Alessandro Pasotti almost 2 years ago

Can you please provide an example project and data to reproduce the issue?

#2 Updated by Alessandro Pasotti almost 2 years ago

I just tested a similar scenario in QGIS 3 and it works just fine, can you try a recent build of QGIS 3?

#3 Updated by Giovanni Manghi almost 2 years ago

  • Crashes QGIS or corrupts data changed from Yes to No
  • Status changed from Open to Feedback

Are you speaking of the core C++ plugin?

#4 Updated by Petri Latva-Käyrä almost 2 years ago

I unfortunately cannot test with QGIS 3, as I do not have permissions in my office computer to update software myself. But it sounds great if the issue would be solved in newer version. We are migrating to QGIS 3 in some point anyways.

I am not sure if this is the core C++ plugin. It was automatically installed in the core QGIS, so I would guess so. It is shown as "Geometry Snapper" in the Plugins-window.

I will try to put together a suitable example data for the case, if and when I have time.

#5 Updated by Giovanni Manghi almost 2 years ago

Petri Latva-Käyrä wrote:

I unfortunately cannot test with QGIS 3, as I do not have permissions in my office computer to update software myself. But it sounds great if the issue would be solved in newer version. We are migrating to QGIS 3 in some point anyways.

I am not sure if this is the core C++ plugin. It was automatically installed in the core QGIS, so I would guess so. It is shown as "Geometry Snapper" in the Plugins-window.

I will try to put together a suitable example data for the case, if and when I have time.

is unlikely that the tool in 2.18 will get a fix... please test on qgis 3 and report back, when you can.

#6 Updated by Jürgen Fischer over 1 year ago

Please test with QGIS 3.4 - QGIS 2.18 reached it's end of life.

#7 Updated by Giovanni Manghi over 1 year ago

  • Resolution set to no timely feedback
  • Status changed from Feedback to Closed

Closing for lack of feedback.

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