On 18/06/09 15:26, maven apache wrote:
> Thanks I have tried it ,and I found each transfered vector map is 
> not compatible with the real color position of the image......


You will have to give us more info than that if you want any help. What
do you mean by "not compatible" ?
Have you set your working region correctly ? Try g.region
rast=YourRasterMap before r.to.vect (or maybe with res= to set to a
finer resolution).

Moritz
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