[Qgis-user] vector editing in QGIS - questions and issues (PostGIS biased)

[Maciej Sieczka]

Christopher Barker pisze:
> Maciej Sieczka wrote:

>> Another thing - IMO users more often need snapping than they don't.

> I don't know that that's true -- I don't think I ever need snapping. 

Oh yes you do :).

> Though maybe I'm mis-understanding what snapping means -- I think it 
> means that when you move a point (for instance), it's final coordinates 
> will be adjusted to fit a pre-defined (though changeable) grid -- i.e. 
> rounded to a given resolution. I can see how this is useful, but why do 
> you think it's the most common need?

That's not how it works in QGIS.

>> Help
>> users not to digitize overlapping features by default, eg. promote 
>> using snapping rather than not using it. I'd be also in favor of 
>> enabling the QGIS "topological editing" feature by default.

> I'm confused about what snapping has to do with overlapping features? Or 
> is the idea that if a user intends to put two points at the same 
> coordinates, snapping makes that easy, where without snapping, it's easy 
> to have two polygons overlap (or have a gap), when you intend them to 
> abut each-other?

Yes, that's how snapping in QGIS 0.9.2 works. You can configure it to 
snap only to vertices on the linestring, to linestrings along their 
whole lenght (segments) or to both - my favorite.

Maciek