[Qgis-community-team] Why polygons created with "Avoid intersections" over lap their neighbors in Postgis?

[Tim Sutton]

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Regards

Tim


On Wed, Jun 26, 2013 at 8:49 AM, Cao Minh Tu <caominhtuvn at gmail.com> wrote:

> Hi,
>
> I found that polygons created with "Avoid intersections" on a Postgis
> layer will sometimes over lap their neighbors. As I don't want overlapping
> polygons on my Postgis layer, I implemented a trigger function using
> ST_Overlaps to automatically detect and reject them. Because the mismatch
> behavior between Qgis and Postgis as stated above, a simple check like that
> won't work. To achieve the same result, I would have to re-shape newly
> created polygons with ST_Union and ST_Difference in my trigger function,
> which is a lot of work to do - since I am a newbie and finding my way
> through GIS and database world.
>
> My question is: Is there an easier way to make Qgis "Avoid intersections"
> plays well with Postgis "st_overlaps" so I can avoid the other dreaded way?
>
> Thanks!
>
> My same question on gis.stackexchange<http://gis.stackexchange.com/q/64177/5901>
>
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Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
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