[GRASSLIST:2704] Re: r.thin , where am I wrog?

[Markus Neteler]

On Wed, Nov 28, 2001 at 06:20:07PM +0100, michele.rocc at libero.it wrote:
> Hi,
> 
> I tried to vectorize a simple map:
> ported to pnm(ppm) with the gimp, from a jpg;
> run r.thin, after 5 iterations had a thinned map;
> but running r.line I had the message: not thinned properly...
> 
> do the map have to be  in a particular format to have a properly
> thynned map? 
> 
> thanks for help,       Michele.

Hi Michele,

I had the same problem... It seems that r.thin doesn't 
write NULL data properly - the zeros are treated as 
cells to get eliminated.

I think I have fixed it recently in CVS, can't remember. Can you
try that version and report again?

Thanks,

 Markus Neteler