[GRASS-user] Watershed crossovers

[Lyle E. Browning]

Perhaps an odd request, but as an archaeologist, I am looking at crossover's from one watershed to another. Typically these involve starting at a stream in one watershed, following a game trail up a ravine to a ridge and then down into a similar ravine into another watershed. Optimal foraging strategy by whitetail deer is the issue. These animals have used these trails for literally thousands of years with hunters on tongues of land overlooking both streams and the ravines, resulting in archaeological sites adjacent to the game trails but not on other tongues of land that aren't as easy to traverse as the optimal trails. These trails are the least physically taxing and shortest distances from one watershed to another. For whatever reason, deer use these trails daily, despite modern development, roadways and the like as impediments. These game trails also explain why of four identical tongues of land, 2 saddling the ravine will have sites and the 2 not saddling the ravine will not.

Is there a way in GRASS to isolate these?

Thanks in advance,

Lyle Browning, RPA