[postgis-users] Editing Topology with QGIs, nno more precision issues

Rémi Cura remi.cura at gmail.com
Wed Aug 6 03:09:15 PDT 2014

I do use QGis snapping which is essential.
I'm talking about errrors in the 15 or 16 th digit!
Usually it is nothing to worry about, but st_buildArea is very fragile.

The point of this is being able to edit only geometry (no topology)
without  plugin, which is not available for every version / GIS.
I feel if you want to edit topology information you need dedicated tools
(like the pluggin, or maybe using the function ST_ChangeEdgeGeom, which in
can't use in my use case )


2014-08-05 20:17 GMT+02:00 Sandro Santilli <strk at keybit.net>:

> On Tue, Aug 05, 2014 at 08:04:55PM +0200, Rémi Cura wrote:
> > Hey,
> > I noticed that QGIs is introducing slight errors when editing topology
> > edge_data layer (with the regular edition, no pluggin ).
> >
> > This is dangerous because function such a s ST_getFaceGeometry won't work
> > afterward (in some case).
> Are you aware of the QGIS built-in snapping support ?
>  Settings -> Options -> Digitizing
>  Settings -> Snapping options
> The controlled way to edit edges would be via ST_ChangeEdgeGeom, which
> ensures topology is also preserved (something that would need to be
> added to the topological editing toolbox...)
> --strk;
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