Bug report #1758
Tools (Ftools): clip and difference tools give the same results
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: |  cfarmer - | ||
| Category: | Python plugins | ||
| Affected QGIS version: | Regression?: | No | |
| Operating System: | All | Easy fix?: | No |
| Pull Request or Patch supplied: | Resolution: | worksforme | |
| Crashes QGIS or corrupts data: | Copied to github as #: | 11818 |
Description
a) pick a layer
b) pick a grid that overlaps the above layer
c) do a "clip" operation with ftools using the grid as "clip layer"
d) do a "intersect" operation with ftools using the grid as "clip layer"
e) compare the results, seems to me identical
Should the "Clip Tool "use just the borders of the "clip layer"?.
Here you can download the shapesfiles (epsg 20790) I used/resulted in my test (qgis 1.2 rev. 11023, Ubuntu 9.04). "Inso" is the base layer, the rest are pretty self-explanatory.
Associated revisions
Fix clip geoprocessing function: Fixes #1758
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@11339 c8812cc2-4d05-0410-92ff-de0c093fc19c
Fix clip geoprocessing function: Fixes #1758
git-svn-id: http://svn.osgeo.org/qgis/trunk@11339 c8812cc2-4d05-0410-92ff-de0c093fc19c
Additional updates to 'Clip' Geoprocessing tool: Properly fixes #1758.
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@11348 c8812cc2-4d05-0410-92ff-de0c093fc19c
Additional updates to 'Clip' Geoprocessing tool: Properly fixes #1758.
git-svn-id: http://svn.osgeo.org/qgis/trunk@11348 c8812cc2-4d05-0410-92ff-de0c093fc19c
History
#1
Updated by cfarmer - over 15 years ago
- Status changed from Open to Closed
- Resolution set to fixed
Should now be fixed in b466b2b6 (SVN r11340). Please test and reopen ticket if not fixed properly.
Note: In some cases geometries may still be mis-formed. This is a separate issue, and will be addressed soon.
- Carson
#2
Updated by Giovanni Manghi over 15 years ago
Replying to [comment:2 cfarmer]:
Note: In some cases geometries may still be mis-formed. This is a separate issue, and > will be addressed soon.
See attached image. Is this one of this cases?
#3
Updated by cfarmer - over 15 years ago
Replying to [comment:4 lutra]:
See attached image. Is this one of this cases?
Yes. This appears to be an issue with the type of geometries that GEOS is returning. I have tried to eliminate these spurious geometries, but as you can see there is still some cleaning up to do...
-Carson
#4
Updated by Giovanni Manghi over 15 years ago
I don't know if it is important, but have you noticed that with Intersect this doesn't happens?
#5
Updated by cfarmer - over 15 years ago
Replying to [comment:4 lutra]:
See attached image. Is this one of this cases?
This should now be behaving properly in ad3028bb (SVN r11349). I have changed the underlying logic, so this tools should be slightly faster, and work better with large, complex datasets.
The test dataset provided with this ticket now works properly (as far as I can tell), however, please test and reopen this ticket if problem(s) persists.
-Carson
#6
Updated by Giovanni Manghi over 15 years ago
Replying to [comment:7 cfarmer]:
The test dataset provided with this ticket now works properly (as far as I can tell), however, please test and reopen this ticket if problem(s) persists.
Seems to work fine!
Thanks a lot,
-- Giovanni --
#7
Updated by Paolo Cavallini about 15 years ago
- Status changed from Closed to Feedback
- Resolution deleted (
fixed)
Now clip and difference seem to give the same result
#8
Updated by Giovanni Manghi almost 15 years ago
- Resolution set to worksforme
- Status changed from Feedback to Closed
Hi Paolo, I made a few tests and seems to me that clip and difference are giving the right results. Feel free to reopen if is the case.