Please what's the procedure or commands for extrating road network from a raster map? i think i have been going round the circle with classofocation and rectification of image. i have used this commands but i don't get any results: i.group i.composite i.class i.cluster r.digit i.maxlik i.gensigset nothing seems to get me the road network result i want. Please i need help and i am running GRASS on Linux Ubuntu. thanks.
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