Bug report #13092
Voronoi polygons wrong if adding a 1 m buffer
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: |  Victor Olaya | ||
| Category: | Processing/QGIS | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | duplicate |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 21159 |
Description
When running the exercise john snow from the training manual, the voronoi polygons from QGIS algs are calculated correctly whn using buffer 0, but are wrong if a buffer = 1 m is added. See attached image (a polygon with two points, an one empty)
History
#1
Updated by Andrew Bevitt over 9 years ago
This looks like a duplicate of #8002
#2
Updated by Paolo Cavallini over 9 years ago
The phenomenon is different; unsure if the underlying problem is the same.
#3
Updated by Andrew Bevitt over 9 years ago
If it is a duplicate then the empty polygon is partially covered by the polygon which appears to have two points. Try changing the layer transparency to see if this is the case.
#4
Updated by Paolo Cavallini over 9 years ago
It is not.
Thanks.
#5
Updated by Giovanni Manghi over 9 years ago
- Status changed from Open to Closed
- Resolution set to duplicate
The voronoi result with buffer with the "pumps" vector from the training manual dataset has indeed overlapping polygons, and indeed the patch proposed in #8002 solves the issue, at least the one described in this ticket.
#6
Updated by Håvard Tveite over 6 years ago
The errors caused by using buffer (correct polygons when not using buffer - incorrect when using buffer) still existed in 3.2.
The buffer error should be fixed with a recently merged pull request (https://github.com/qgis/QGIS/pull/7469).
#7
Updated by Paolo Cavallini over 6 years ago
This is apparently a duplicate. Please add your comment to the other ticket. Thanks.