[GRASS-user] Re: what are the side effects of working with topologically incorrect lines?

G. Allegri giohappy at gmail.com
Tue Nov 22 15:18:23 EST 2011

Probably I'm wrong: the self intersecting line doesn't produce errors with
Mmm, I thought it wasn't compliant with G1 scheme...


2011/11/22 G. Allegri <giohappy at gmail.com>

> I'm studying better the topological scheme assumed by GRASS, which if I'm
> not wrong is G1.
> I'm doing some basic tests to understand the side effects of working with
> not topologically clean entities, like self-intersecting lines.
> Original line: http://bit.ly/vfIJiM
> Cleaned up line: http://bit.ly/uHKpoT
> The unclean line is topologically incorect, right?
> Where the not topological version can give us problems, (excluding the
> v.net modules)?
> The question raises from the need to understand if I can bypass line
> cleaning for various data processing I'm going to do, mainly overlay, data
> extraction, profile analysis, etc.
> Thanks,
> giovanni
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