[GRASSLIST:7056] Re: vector map from scanned streetmap

[Miha Staut]

Autotrace gave me good results as well. After importing you transform the map
to the original coordinate system with v.transform.

Miha Staut


--- Jachym Cepicky <jachym.cepicky at centrum.cz> wrote:

> well,
> one could do it by
> 
> r.mapcalc streets="if(input == color, 1, null())"
> r.thin in=streets out=streets.th
> r.to.vect feature=line in=streets.th out=streets
> v.clean in=streets out=streets2 tool=prune
> 
> Jáchym
> 
> On Tue, Jun 07, 2005 at 09:14:30AM +0100, dooshiant wrote:
> > Hi all,
> > 
> > I am new to using GIS and would like some help with GRASS 6.0.
> > I am trying to digitise old streetmaps into vector format. The scanned
> > images are in TIFF/PNG format and I want to draw vector graphics from
> > them. Any hint of the best way of doing this? Is there any online
> > documentation/tutorials you could point me to?
> > 
> > Thanks & regards,
> > 
> > dooshiant
> > 
> > 
> > 	
> > 	
> > 		
> > ___________________________________________________________ 
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> 
> -- 
> Jachym Cepicky
> e-mail: jachym.cepicky at centrum.cz
> URL: http://les-ejk.cz
> GPG: http://les-ejk.cz/gnupg_public_key/
> 
> 



		
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