Bug report #12730
"Check Geometry Validity" produces incorrect result
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: | - | ||
| Category: | - | ||
| Affected QGIS version: | 2.8.1 | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 20830 |
Description
The following is a valid, two-part MULTIPOLYGON:
MULTIPOLYGON (((-71.757875 44.565735, -71.748526 44.560716, -71.758014 44.564355, -71.757875 44.565735)),
((-71.760777 44.567292, -71.75725 44.56739, -71.757875 44.565735, -71.760777 44.567292)))
The "Check Geometry Validity" tool reports the following:
1,segment 0 of ring 0 of polygon 0 intersects segment 0 of ring 1 of polygon 1 at -71.757875, 44.565735
1,Geometry has 1 errors.
Using build 2863f20
Associated revisions
geometry validator: fix touching lines check (followup b9b9bc3, fixes #12730)
geometry validator: fix touching lines check (followup b9b9bc3, fixes #12730)
(cherry picked from commit 3eef29ab1bd4cc007b7db5012dad23d9c39e2249)
History
#1
Updated by Arnaud Morvan over 9 years ago
The two parts of the polygon have one point in common.
In Settings/Options/Digitizing/Feature creation, there is two options for validity checking which are QGIS or GEOS.
When checking the validity from ftools menu entry,
QGIS method effectively returns that the poligon is not valid:
1,segment 0 of ring 0 of polygon 0 intersects segment 0 of ring 1 of polygon 1 at -71.757875, 44.565735
1,Geometry has 1 errors.
GEOS method returns that the polygon is valid.
#2
Updated by Giovanni Manghi over 9 years ago
- Status changed from Open to Feedback
- Category set to 44
Arnaud Morvan wrote:
GEOS method returns that the polygon is valid.
shoud we close this then?
#3
Updated by Daniel Baston over 9 years ago
That's interesting. Is the intent of the "QGIS Method" to validate against a different set of rules than GEOS / OGC?
#4
Updated by Daniel Baston over 9 years ago
- Assignee set to Jürgen Fischer
#5
Updated by Jürgen Fischer over 9 years ago
- Category deleted (
44) - Assignee deleted (
Jürgen Fischer)
#6
Updated by Jürgen Fischer over 9 years ago
- Status changed from Feedback to Closed
Fixed in changeset 3eef29ab1bd4cc007b7db5012dad23d9c39e2249.