[Qgis-developer] Quick fixes and error communication for ftools

[Marco Hugentobler]

Hi

 >ad issue 1: update fTools to warn users when some features cause problems
 >ad issue 2: quick fix fTools to convert geometry collections to single 
geometry types

A function that takes a geometry type and extracts the longest line / 
the largest polygon / the first point from the geometry collection 
should be straightforward to do.

 >These fixes/updates would be made available as fTools updates via the 
plugin installer asap

If the fix does not take too long, we probably don't need a warning at all.

Regards,
Marco

On 23.11.2015 21:35, Anita Graser wrote:
> Hi,
>
> If you are following the psc list, you've probably seen the thread 
> discussing current shortcomings of ftools 
> (http://lists.osgeo.org/pipermail/qgis-psc/2015-November/003623.html)
>
> In short, the key issues are:
> 1. When ftools encounter issues with certain features, warning 
> messages get written to the log but this is largely hidden from users 
> since they would actively have to actively monitor the log. The 
> problematic features are then missing from the results but this is not 
> always obvious.
> 2. The above issue is more common now (since 2.10) since underlying 
> libraries more often (and correctly so) produce geometry collections 
> as outputs. These geometry collections are not handled well by the 
> current ftools code which is much older.
>
> To address these issues, the following suggestions have been made so far:
> ad issue 1: update fTools to warn users when some features cause problems
> ad issue 2: quick fix fTools to convert geometry collections to single 
> geometry types
>
> For the warnings, there's already a first PR draft 
> https://github.com/qgis/QGIS/pull/2432 which needs to be fleshed out.
>
> These fixes/updates would be made available as fTools updates via the 
> plugin installer asap.
>
> If you have ideas how to handle this efficiently or have already 
> implemented code that addresses similar issues, let us know.
>
> It would be good to have a quick discussion in order to be able to 
> provide improvements fast.
>
> Best wishes,
> Anita
>
>
> _______________________________________________
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20151124/6d343b3a/attachment-0001.html>