Bug report #21354
SAGA Difference wrong result
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Processing/SAGA | ||
| Affected QGIS version: | 3.5(master) | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | up/downstream |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 29172 |
Description
Hi
Using SAGA Difference in processing I try to create a new layer with the result as a difference between the two layers.
It gives a 'strange' result.
I have controlled for illegale geom, overlap and duplicates - OK
If I use select by location the result is correct.
Data added in Geopackage
History
#1
Updated by Nyall Dawson almost 6 years ago
- Resolution set to up/downstream
- Status changed from Open to Closed
This bug is in saga itself - use the native QGIS difference tool instead, it's well tested, faster, and more robust.
#2
Updated by Pedro Venâncio almost 6 years ago
- File test_saga_720.jpg added
- File test_saga_232.jpg added
This seems a bug in SAGA version 2.3.2, used by QGIS.
I've just tested Difference algorithm with Lene dataset in native SAGA 2.3.2 and 7.2.0, and 2.3.2 gives the problem described, but 7.2.0 gives the correct result, as you can see in the images attached.