Hi Giovanni
Am 20.06.2017 um 14:18 schrieb Giovanni Manghi:
Hi,
Hi,
I would like to raise attention for an issue which was discussed in
length in the qgis-users list [1]
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 [2].
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
users' perspective.
- 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 :)
is strange this thread is seemingly not getting much traction at least
in the dev list. Having a core digitizing tool that cripples
geometries do not look good to me, and apparently a good solution has
been implemented (or had to) in a plugin. Isn't worth having core
doing it the right way?
cheers
-- G --
I would definitely wish to have proper tools in core but as I am not a
C++ guy all I can do is implement things in a Python plugin :-(
DigitizingTools is an effort to provide missing tools until there is a
solution in core (I just abandoned a tool whose functionality has been
implemented). I welcome any C++ dev going ahead and copying (and
improving) the tools I provide.
You may have seen that I commented on [1]
Bernhard
[1] https://issues.qgis.org/issues/12754
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