Hi Andreas,
I have no problem with invalid geometries in my PostGIS test layers with
split parts using QGIS 2.14.15 on Linux.
Without having your data I cannot tell why yours are invalid.
Anyway you might try DigitizingTools plugin which has a tool that
deletes a part of a multi feature and inserts it as a new (single-part)
feature which might be easier to handle. You can later merge it to any
feature you like. There is also a tool to fill gaps between features
with a new feature.
Bernhard
Am 30.05.2017 um 16:41 schrieb Andreas Wicht:
On 29 May 2017 at 13:16, Andreas Wicht <a.wi...@gmail.com> wrote:
On 28 May 2017 at 14:43, James Wood <jwood...@gmail.com> wrote:
On the digitizing toolbar, try "Split Parts" instead of "Split Features" on
multipart polygons.
Thank you for the hint, James. Somehow I always thought that this
function is only suitable for separating an existing part from a
feature (never used it though).
Yet, if you cut a polygon with the "Split Parts" tool, the output will
be an invalid geometry (I observed self-intersections). This as well
can not be the intended behavior. I could observe those errors in
simple scratch layers as well as in PostGIS layers.
Has anybody else experienced this behavior?
Is my assumption right, that according to this issue
(https://issues.qgis.org/issues/12799) the current workflow would have
to look somewhat like this:
- use split parts tool to split the multipart polygon
- delete the newly created part (-> invalid geometry) using the
"Delete Part" tool
either
- create a new feature/new part (depending on the use case) inside the
hole created by deleting the part
- optional: attribute merging with other features surrounding the new
feature (depends on the complexity of the attribute table)
- change desired attribute(s) (which led to the decision to separate the area)
or
- use the "Reshape Features" tool to enlarge a neighbouring polygon by
the cut off area
or
- create new feature inside the hole and merge it ("Merge Selected
Features" tool) to enlarge a neighbouring polygon by the cut off area
Isn't that a bit too much post-processing for that cause?
Any thoughts?
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