[Qgis-user] Fix Geometries

[Nicolas Cadieux]

Hi,

The Geometry Checker plugin will add a the 'Check Geometries' option in 
the vector menu.  It is very unstable with the current version of QGIS.  
If you get it to run, it should solve most problems.  I get it to run 
when I only select one test at a time.

The most predictable tool is the vector/geometry tools/Check validity 
using the 'QGIS' Method (not GEOS).  That should fix your file.  There 
is a 'remove duplicate vertices' and 'delete duplicate geometries' in 
processing.  Your problem could also be caused by a module not working 
with multipart objects.  Go to vector/Geometry tools/Multiparts to 
singleparts.

If your lines don't touch,   try the 'snap Geometries to layer ' in 
processing.

Nicolas

On 2019-05-21 2:54 a.m., Mithoefer wrote:
> Hi Finnbar,
>
> What plugin are you talking about and what QGIS version do you use?
> You have a number of tools to check geometries. Try "Topology checker" 
> or "Geometry checker" to see where the problems are (invalid 
> geometries). Geometry checker is also able to fix some issues. Maybe 
> thats the one you use.
>
> Anotehr option is GRASS GIS. Have you ever worked wit GRASS GIS? You 
> can create a GRASS database and import your polygons. GRASS GIS uses a 
> topolgical data model and is quite powerful in establishing a desent 
> data model with snapping options and clean functions. You can also try 
> GRASS tools from the processing framework like build polygons or clean.
>
> Regards
> Klaus
>
> Am 20.05.19 um 11:31 schrieb GILLEN Finbar:
>> Hi All,
>>
>> I have a few polygon layers where anytime I go to use them I have to 
>> use the fix geometries plugin so that invalid geometries are fixed.
>>
>> When I save the output from the fixed geometries plugin and add it in 
>> a new project the same issues appears where I can’t use it accurately 
>> to do a Select or Join by Location because some of the geometries are 
>> still seen as invalid even though they have been ‘fixed’.
>>
>> Is there anyway solution to this or do I have to keep using the fix 
>> geometries plugin anytime I use the polygons for analysis?
>>
>> Regards
>>
>> Finbar
>>
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