[GRASSLIST:7046] Re: vector map from scanned streetmap

Jachym Cepicky jachym.cepicky at centrum.cz
Tue Jun 7 05:27:56 EDT 2005

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


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
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