Fwd: Re: [Qgis-user] Editing polygons

[Andreas Neumann]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

sending this also to the list ...

- -------- Original Message --------
Subject: Re: [Qgis-user] Editing polygons
Date: Mon, 27 Jun 2011 22:25:31 +0200
From: Andreas Neumann <a.neumann at carto.net>
To: Laura Guillot <lguillot.a at gmail.com>

Hi Laura,

QGIS uses the simple features format. It will always store data of
adjacent polygons in a "redundant" way. ESRI ArcGIS uses the same model.

If you are looking for a topological file format, you could use GRASS
and use the GRASS digitizing tools (outside or within QGIS).

I am bit surprised that the "topological editing" of QGIS doesn't work
in your installation. It works fine with my data. Can you post a bit
more information about your installation, such as QGIS version,
operating system, etc.?

Andreas

On 06/27/2011 05:41 PM, Laura Guillot wrote:
> Thank you, but it dosen´t works.
> The problem is the same. I have two diferrents lines and I want just one to
> difference the polygons. When I want to move a line, the other part dosen´t
> move at same time, so I have a hole in my map.
> Can I make a single line to separate both poligons?or there is any way to
> change the line to segments?
> Thank you.
> Laura
>
> 2011/6/27 Andreas Neumann <a.neumann at carto.net>
>
>> 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<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<https://sites.google.com/site/lguillotdummy/home/boundaryproblem.jpeg>
>>>
>>
>> --
>> --
>> Andreas Neumann
>> Böschacherstrasse 10A
>> 8624 Grüt (Gossau ZH)
>> Switzerland
>> ______________________________**_________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/**mailman/listinfo/qgis-user<http://lists.osgeo.org/mailman/listinfo/qgis-user>
>>
>

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iQEcBAEBAgAGBQJOCOdeAAoJELiCsGDopvBCYewH/0YwehDRrAqzfQ52CJe0EuUE
k35d53n1LhmUSagm9SZGEFKtU9+HQGS1SB3qNqpAtLl2QDVSBSXzelSojJV2oANQ
IjN8bOuPxZj/w5ihQUeBYcTR1H0ZTh1MMp3RFxYdbPlZsuc4W1Jb4mouu4QRyrKa
ZdKKBUW1qhJHdH8Os2Jnghd1ud1/J5l12Dp9JzVdDzFU21GdG1IMYdSbezq22MIT
1dxHV6KxBl+2nWJTcqTNDttTJ5vNpIOSJiolZZckjp4bCUf4qUUSUZ5OsGB4H9xS
fF+QKW6aie9IqJMZJ3RliBy0gAdeG+7aIpBboT3mer1U/yt0paC6WFHO6gfKeJs=
=6Hj4
-----END PGP SIGNATURE-----