[Qgis-user] Running v.clean on a QGIS vector layer (Polygon) through Sextante

[Paolo Cavallini]

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Il 30/04/2013 13:10, SBL ha scritto:

> I was wondering: When I run v.clean on a QGIS vector layer through Sextante,
> a temporary GRASS location is created, the GRASS topology for the QIS-layer
> is build, v.clean applied and the result exported to shape, am I right?

Yes.

> That is in general really very useful. Especially because (Q)GIS-beginners
> do not have to aquaint themselfs also with GRASS in order to make use of
> it`s topology model!

Thanks.

> Since GRASS applies som cleaning, at least when importing Polygons, is there
> a possibility to adjust the cleaning procedure from v.in.ogr there?

Not advisable: the user must know if it is going to snap or remove small areas.

> Building the topology and cleaning can be quite time consuming. Is it
> possible to run more than one cleaning algorithm on one non-GRASS-input at
> once, like snapping, breaking boundaries, removing dangles and
> duplicates...?

For this one should prepare a script, chaining several grass commands; then it's easy
to add the script to sextante.

All the best.
- -- 
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario
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