All,
Any suggestions on how best I could split up a region into 40-60 acre segments using linear features (ridges, streams, roads, trails, etc.)? The watershed tool seems to split along ridges and ravines fairly well, however, it seems I can only define the lower area limit not the upper…
Thanks,
Josh Q
On 05/12/17 01:09, Joshua Quesenberry wrote:
All,
Any suggestions on how best I could split up a region into 40-60 acre segments using linear features (ridges, streams, roads, trails, etc.)? The watershed tool seems to split along ridges and ravines fairly well, however, it seems I can only define the lower area limit not the upper..
Are you speaking about linear features in images, or about vector maps of linear features ?
If this is for images, what you are speaking about are cutlines. AFAIK, we currently do not have an implementation of cutlines in GRASS GIS. Attached you can find a bash script I threw together trying to implement a cutlines algorithm using i.zc and r.cost+r.drain. It is in a rough state, without any comments, and it works only moderately well. It also doesn't scale well as i.zc puts everything into memory. I will probably have to work on a better version in a few months, but if you or someone else wants to do it before, I won't complain 
You should be able to run it as is in the North Carolina demo dataset to see the results.
Moritz
cutlines.sh (3.25 KB)