[Qgis-user] Saving a polygon in QGis before to edit it

[Matthias Kuhn]

Hi,

I remember geogig (formerly geogit) offers promising concepts for
filebased spatial data management with historization and branching.
Unfortunately I don't know the current status of the project and the
progress of integration in QGIS.

Matthias

On 07/20/2015 11:25 AM, Neumann, Andreas wrote:
>
> Hi Didier,
>
> I don't think that anyone is working on a client-side historisation
> option in QGIS. And there wasn't much demand for that in the past,
> since most serious GIS data resides in databases.
>
> Andreas
>
> On 2015-07-20 09:45, didier peeters wrote:
>
>> Hello Andreas,
>>  
>> yes it's for some 'historisation', more precisely to make a
>> filiation, and yes I certainly will use triggers in PostGIS.  But I
>> wanted to avoid confusion between different kind of edition
>> operations that I'm not currently foreseeing; I'm not sure it will
>> always be easy to distinct this specific action from others.  And I
>> thought that it might also be interesting outside of the database
>> world, to have that "edit and preserve" operation. 
>>
>> Didier
>>
>>     Le 20 juil. 2015 à 09:10, Neumann, Andreas <a.neumann at carto.net
>>     <mailto:a.neumann at carto.net>> a écrit :
>>
>>     Hi Didier,
>>
>>     Is this for historisation purposes? If yes, I would look into
>>     database solutions to do historization.
>>
>>     The SQL-MM standard has this as a built-in tool set for
>>     databases, however, PostgreSQL does not implement this part of
>>     the SQL specification (I believe the latest versions of SQL
>>     server and Oracle 12 does). However, you can simulate the same in
>>     Postgis, using triggers and rules.
>>
>>     Andreas
>>
>>     On 2015-07-20 08:00, didier peeters wrote:
>>
>>         Hello,
>>          
>>         I would like to find the best solution to the following case:
>>          
>>         in QGis, when editing a polygon (splitting it in 2 parts) I
>>         need to save the original shape, in order to keep the
>>         different steps of its evolution; this operation is likely to
>>         be repeated several times.  The solution I found is to 
>>
>>           * start by copying the polygon, 
>>           * then edit it (split) 
>>           * then pasting back the original one, 
>>           * then adjust and update the attributes of the 2 new
>>             polygons.  
>>
>>          
>>         Is there a less tricky way to achieve this ?  
>>          
>>         If not it would be nice to have an option in the save dialog
>>         (with a default behaviour set in the Settings), and I would
>>         file a feature request.  
>>          
>>         Didier
>>
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>>      
>>      
>>
>>
>>
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