[QGIS-Developer] Split parts tool - invalid output
a.wicht at gmail.com
Mon Jun 19 06:54:03 PDT 2017
I would like to raise attention for an issue which was discussed in
length in the qgis-users list 
You can ignore the beginning of the discussion where I mixed up "Split
parts" and "Split features".
The split features tool does not produce valid geometries. This can be
easily reproduced by splitting one part of a multipart feature and
then try to split that part again (or save and check the feature with
e.g. postgis' st_isvalid()). This goes hand-in-hand with the comments
in a related, older issue .
This makes the workflow much more complex [see 3], if you want to have
a valid output at the end.
The discussion ended in a new Tool in the DigitizingTools (0.11.0)
plugin (thank you Bernhard), which acts much more intuitive from a
- singlepart features are split and one half inserted as a new feature
- multipart features are split and the user has to choose which part
gets inserted as a new feature, while the other half stays a multipart
feature with all other parts still connected
This raises the question if and how to get that to replace the core tools.
Happy for any input :)
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