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
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