[Qgis-user] Fix Geometries

[DelazJ]

Hi Jürgen,

I know that we don't have black box and this was certainly not the
appropriate term to use. Sorry. Still, most of the users have no means to
read the code but need to use any of these options. Without understanding
what they do, it becomes simply a click-click business (not empowering
them). So it could be nice we shed some light on them (maybe something for
a grant proposal?).

Greetings,
Harrissou

Le mer. 22 mai 2019 à 11:55, Jürgen E. Fischer <jef at norbit.de> a écrit :

> Hi Harrissou,
>
> On Wed, 22. May 2019 at 11:03:56 +0200, DelazJ wrote:
> > *> The QGIS method is an internal method that can return multiple errors
> > and was > IIRC introduced, when GEOS could just report one error at a
> time
> > without a > location and we couldn't or didn't yet use it threaded.
> > Essentially it was > just made to highlight digitizing errors.  It might
> > miss some rules or > interpret some edge cases differently than GEOS.*
> >
> > So there are some historical reasons. Unfortunately, this does not seem
> > enough to clarify things and wouldn't deserve a place in the docs (I may
> be
> > wrong!).  If anyone has more details, please tell us. I think it could be
> > worth clarify and document the differences if they are clear enough or
> > merge the tools in the future if possible, avoiding confusion for users
> (we
> > should not have kind of black box ;) in QGIS).
>
> We don't have a blackbox.  The ultimate source of information about the
> QGIS
> method is the QGIS method:
>
> https://github.com/qgis/QGIS/blob/master/src/core/qgsgeometryvalidator.cpp
>
> But there isn't a comparison on what GEOS and that method do differently.
>
>
> Jürgen
>
> --
> Jürgen E. Fischer           norBIT GmbH             Tel. +49-4931-918175-31
> Dipl.-Inf. (FH)             Rheinstraße 13          Fax. +49-4931-918175-50
> Software Engineer           D-26506 Norden
> https://www.norbit.de
> QGIS release manager (PSC)  Germany                    IRC: jef on FreeNode
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20190522/38304e12/attachment.html>