[GRASS-user] Re: grass-user Digest, Vol 47, Issue 52

[Markus Neteler]

On Mon, Mar 29, 2010 at 8:58 AM, Nathaniel Iwuchukwu
<ikechinedu at gmail.com> wrote:
> 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.

1. r.thin: thinning of lines
2. r.to.vect: generate vector lines

Markus