[GRASS-user] v.generalize threshold and boyle's algorithm
JRadinger at gmx.at
Wed Feb 8 04:38:04 EST 2012
-------- Original-Nachricht --------
> Datum: Tue, 7 Feb 2012 18:00:26 +0100
> Von: Markus Metz <markus.metz.giswork at googlemail.com>
> An: Johannes Radinger <JRadinger at gmx.at>
> CC: grASS user list <grass-user at lists.osgeo.org>
> Betreff: Re: [GRASS-user] v.generalize threshold and boyle\'s algorithm
> Johannes Radinger wrote:
> > Hello,
> > after some month a tried an script again which
> > calls v.generalize. It seems that this module
> > has changed in version 6.4.2 and 6.5SVN.
> > Before I could use following:
> > grass.run_command("v.generalize",
> > input = input,
> > output = "vector_gen",
> > method = "boyle",
> > look_ahead = 8,
> > overwrite = True)
> > Now it seems that v.generalize needs a threshold value (required!)
> > although the manual states only: Input parameters: input, look_ahead
> Right, the module requires threshold, but Boyle (and some other
> methods) do not require threshold, instead they require other
> parameters. Threshold being required is maybe annoying, but not that
> serious, more serious is that the module does not check if all
> parameters for the selected method are specified.
> > I am confused now if this value is really necessary for calculating
> boyle's algorithm and if yes how should a value be choosen?
> Threshold is not used by boyle, just give the module some dummy value.
Thank you for that answer. Of course its not of big deal to provide a dummy value, I was just confused.
> > Moreover I'd like to know what means the 'r' flag (backwards
> compatibility), were there any major changes in recent time (last year)?
> A number of bugs were fixed because v.generalize produced corrupt
> output in 6.4.1 (see e.g. recent ml thread ).
> Markus M
>  http://lists.osgeo.org/pipermail/grass-user/2012-January/063327.html
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