[GRASS-user] v.to.rast, r.to.vect, "stable" transformation

[Rainer M Krug]

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On 26/01/12 10:29, Johannes Radinger wrote:
> Hello,
> 
> as it seems that there was something wrong with my post yesterday
> I send it again (if everything was ok already yesterday, sorry for
>  double posting):

Your post went through - but some mail readers don't show your own
posts, and some mailing lists don't send you your own posts...

So what i usually do when checking, I go into google and search for
the topic of my post - if it was posted, it will show up in e.g. gmane
or any other site. If it does not (within a few hours) you can assume
that it did not went through and post it again.

Sorry - no idea about your question.

Cheers,

Rainer
> 
> 
> For a certain application I need to transform a river from the 
> raster format into the vector format and vice versa.
> 
> I'd like to know how good does it work to tranform a line feature 
> from vector into raster and back again into a vector? Is there any 
> "stable" line which doesn't change anymore after x-times 
> transforming back and forwards? I haven't had time to test it but
> I thought about:
> 
> v.to.rast r.thin r.to.vect
> 
> this should result in a "stable" line or does it need several 
> iterations?
> 
> Has anyone tested such things and can share the experience?
> 
> Probably it depends on the resolution and the shape (bends etc.)
> of the line vector...
> 
> Maybe there is already a tool out which generalises, produces and 
> tests a "stable" raster-vector-line.
> 
> Any hints and suggestions are mostly welcome...
> 
> best regards, Johannes
> 
> _______________________________________________ grass-user mailing 
> list grass-user at lists.osgeo.org 
> http://lists.osgeo.org/mailman/listinfo/grass-user


- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

Tel :       +33 - (0)9 53 10 27 44
Cell:       +33 - (0)6 85 62 59 98
Fax :       +33 - (0)9 58 10 27 44

Fax (D):    +49 - (0)3 21 21 25 22 44

email:      Rainer at krugs.de

Skype:      RMkrug
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