[Qgis-user] Double line Feature

[Alexandre Neto]

I also think that buffer is what you really need to use.

In order to snap to the original line just keep it in the project too.

On Tue, Oct 25, 2011 at 1:08 PM, Richard Duivenvoorde
<rdmailings at duif.net>wrote:

> On 2011-10-25 13:52, Matej Mailing wrote:
> > 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 :-)
>
> Ah, is that what you want :-)
>
> That's called a 'Buffer' in gis terms:
>
> - load your cable layer in qgis
> - go to Vector menu and in Geoprocessing tools, choose Buffer
> - there you can choose for example 20 meter, this will create a 20 meter
> buffer == polygon around your lines
> - by creating a second buffer of say 50 meter, and giving that another
> color, I think you will have what you want
>
> Regards,
>
> Richard Duivenvoorde
>
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