Bug report #20840
Keep N biggest parts documentation is incorrect
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Documentation and Help | ||
| Affected QGIS version: | 3.4.2 | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | fixed/implemented |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 28659 |
Description
QGIS 3.4.2 , Windows 10, 64bit
Keep N biggest parts does not consider the input "Parts to keep" returning all the features from the shapefile input and not the number specified, e.g. 1.
Hard disc saving or temp file does not change outcome.
Example that returns all the features without selecting the 3 biggest:
_Processing algorithm…
Algorithm 'Keep N biggest parts' starting…
Input parameters:
{ 'OUTPUT' : 'C:/.../test.shp', 'PARTS' : 3, 'POLYGONS' : 'C:/.../in.shp' }
Execution completed in 0.47 seconds
Results:
{'OUTPUT': 'C:/.../out.shp'}
Loading resulting layers
Algorithm 'Keep N biggest parts' finished_
and from processing command history:
processing.run("qgis:keepnbiggestparts", {'POLYGONS':'C:/.../in.shp','PARTS':3,'OUTPUT':'C:/.../out.shp'})
History
#1
Updated by Nyall Dawson almost 6 years ago
- Status changed from Open to Feedback
You're misinterpreting what this algorithm does - it keeps all features from the input layer, removing parts from individual geometries (e.g. multipolygons) until those geometries have the specified max number of parts.
#2
Updated by Odysseas Vl almost 6 years ago
Maybe I am misinterpreting indeed, I was following the documentation explanation from here: https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#id261
If the case is as Nyall says, then for me the doc was confusing
#3
Updated by Nyall Dawson almost 6 years ago
- Category changed from Vectors to Documentation and Help
- Status changed from Feedback to Open
- Subject changed from Keep N biggest parts does not work as expected to Keep N biggest parts documentation is incorrect
#4
Updated by Harrissou Santanna almost 6 years ago
PR at https://github.com/qgis/QGIS-Documentation/pull/3385
PS: Better report doc issues at https://github.com/qgis/QGIS-Documentation/issues
#5
Updated by Harrissou Santanna almost 6 years ago
- Status changed from Open to Closed
- Resolution set to fixed/implemented
Description is fixed in docs (would be online in a day)