[Qgis-user] Double line Feature

[Lauri Kajan]

On Tue, Oct 25, 2011 at 9:48 PM, Matej Mailing <mailing at tam.si> wrote:
> This is almost it! :-)
>
> Now we get a lot of polygons - is it possible to combine all the polygons
> into one object (so that there are no "borders" inside it)?
>
> Thanks,
> Matej
>
> 2011/10/25 Albin Blaschka <albin.blaschka at standortsanalyse.net>
>>
>>
>> Am 25.10.2011 13:52, schrieb Matej Mailing:
>>>
>>> Basically we need this to define some sort of "protected area" (for
>>> example, 30 cm in both sides from the cable) along some
>>> telecommunication network cables (mainly optical) and therefore I don't
>>> think only the representation would be sufficient. Probably some plugin
>>> that would create polygon with a centralized line that we are "snapping
>>> to" and with defined area (width) would be even better than just two
>>> lines, because this way we could define some color of fill of that
>>> closed "part" around cable in our projects for example. Hopefully I
>>> explained it enough clearly, if you need more information, please let me
>>> know :-)
>>
>> Hello!
>>
>> That sounds like you need a buffer :-)
>> In QGIS, you find this functionality under Vector (fTools plugin) ->
>> Geoprocessing (or similar, I have just the german version at hand at the
>> moment...)
>>
>> Albin
>>
>>
>> --
>> | Albin Blaschka, Mag.rer.nat.
>> | Etrichstrasse 26, A-5020 Salzburg
>> | * www.albinblaschka.info * www.thinkanimal.info *
>> | - It's hard to live in the mountains, hard but not hopeless!
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Hi Matej,

Sure it is possible.
You can use dissolve tool from Vector -> geoprosessing tools -> dissolve.
And in the dialog select dissolve all.

At least in the qgis 1.7.1 the dissolve tool is included in the buffer
tool. In the buffer dialog you can check a dissolve option to dissolve
all the buffers.

Hopefully this helps.

-Lauri