[Qgis-user] How to force exact/korrekt editing polygon layer, (topological)

[Árni Geirsson]

I would add that by styling the polygons with a semi-transparent fill,
inadvertent overlaps become quite visible.

Arni


Árni Geirsson
*Alta ehf* // +354 582 5000 // +354 897 9549

On 11 January 2017 at 08:47, Bernhard Ströbl <bernhard.stroebl at jena.de>
wrote:

> Hi Bernd,
>
> QGIS can prevent gaps/intersections between polygons of the same layer,
> you only have to switch on the options. IMHO QGIS should not always prevent
> this because e.g. users may deliberately leave gaps.
>
> So how can you solve your problem?
> 1) You could teach your users what the options mean and how to use them (I
> regularly teach my users).
> 2) You could further prepare a project for them where the snapping options
> are enabled for the layers in question. If you are in PostGIS create a new
> DB user that has full rights on these tables and load the layers with this
> user account, revoke all editing rights from all other DB users. Thus your
> QGIS users can only edit when they use your prepared project. Be aware that
> QGIS stores username and password in the project file, but I would not see
> a problem in this if your users are as dumb as you claim :-)
> 3) If on PostGIS you could enable triggers on insert/update that does not
> accept invalid polygons/overlaps between polygons. No way to prevent gaps
> during editing; gaps must be identified end eliminated afterwards.
> (4) I have never tried PostGIS' new topology. Maybe it is worth checking
> it out.
>
> Bernhard
>
> Am 11.01.2017 um 09:24 schrieb Bernd Laskowski:
>
>> Hi Jürgen, what about dumbest assumable user <DAU> or lusers?
>>
>> Thanks a lot Harrissou
>> but I know the standard options to use topological editing funktions.
>> I have problems with foolish users. They forget to activat topological
>> editing or snap-option and so on.
>> We need a solution to prevent saving intersections or/and holes/gaps
>> within qgis or postgis.
>>
>> Regards
>> Bernd
>>
>>
>>
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