[QGIS-Developer] Split parts tool - invalid output

Giovanni Manghi giovanni.manghi at gmail.com
Tue Jun 20 05:18:41 PDT 2017


> 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?


-- G --

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