[Gvsig_english] Problem from polylines to polygons

[Antonio Falciano]

Hi Jorge,
I have created 10 features with SEXTANTE "Create random vector layer" 
tool and then applied both "Polygonize" and "Derivative geometries". It 
seems that the results are quite different. The "derivative" polygons 
overlap themselves, while the polygonized ones not. :-(
I'm agree with Fran. In this case, it seems that the external rectangle 
doesn't intersect the internal lines at all, so it's surely a problem of 
precision/snapping. SEXTANTE Polygonize tool nodes lines and merges them 
using an enhanced precision in order to avoid topology exceptions, 
however it doesn't snap "quite near" vertices. I think that we need more 
robust topology checks in SEXTANTE and gvSIG in order to make them more 
reliable and powerful in a production environment.

Cheers,
Antonio


Il 18/05/2011 17.30, Jorge Santos ha scritto:
> Dude, it's very easy convert lines to polygons in gvSIG.You must try 
> the Derivative Geometries.
>
> *Layer Menu - Derivative Geometries*
>
> I draw a similar feature and convert polyline to polygon with close 
> geometries. See attatchment.
>
> Best wishes,
>
> _________________
> Jorge Santos
> Téc. emGeodésiae Cartografia
> http://processamentodigital.blogspot.com/
> http://twitter.com/jpsantos2002
> Skype: jorgepsantos2002
>
> 2011/5/18 Gio_ca <maccionigiovanni at libero.it 
> <mailto:maccionigiovanni at libero.it>>
>
>     I tried what Antonio suggested but I got the same result...
>
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-- 
Antonio Falciano
http://www.linkedin.com/in/antoniofalciano