[Qgis-user] Editing polygons

[Andreas Neumann]

 Hi Laura,

 This is probably easy to solve:

 * Settings --> Snapping Options --> Checkbox "Enable topological 
 editing"

 Does it work for you?

 Depending on the QGIS version the setting may be at a different place 
 in the menu.

 Andreas

 On Mon, 27 Jun 2011 16:32:53 +0200, Laura Guillot wrote:
> I'm trying to reshape polygons of a lancover map, in order to make
> them to be more
> coincident with an overlaid raster image (orthophoto 1:5M).
> If I just move the nodes to the correct position, I create a correct
> line but leave a hole behind: the other
>  polygon keeps its line where it was. See a pict here:
> https://sites.google.com/site/lguillotdummy/home/boundaryproblem.jpeg
> [1]
>
>  Is there any way I could just move the lines as boundaries?
>
> I've tried by converting poygons to lines first, but the problem is
> very much the same: it seems like
> there is always a double line, one for each adjacent polygon.
>
> A possible solution would be having the lines automatically cut into
> segments, each going from one vertex to another.
>  And having just one segment for each boundary. Is that possible? Is
> there a process to cut into segments after running polygons to lines?
>
> Or perhaps there is a cmpletely different way to accomplish the same
> goal: modifying the boundaries between polygons.
>
> Thanks!
>
> L
>
>
> Links:
> ------
> [1] 
> https://sites.google.com/site/lguillotdummy/home/boundaryproblem.jpeg

-- 
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 Andreas Neumann
 Böschacherstrasse 10A
 8624 Grüt (Gossau ZH)
 Switzerland