[GRASS-user] Extracting road network from satellite image using GRASS

[Nathaniel Iwuchukwu]

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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20100329/b8dcccdb/attachment.html