Ok, your average terrain-only based viewshed (view is from a road to the southeast, viewshed is in cyan):
Note that based on these estimates, we should be able to see most of the valley walls from this little slice of road. I don’t buy that. That section of road is pretty closed in with trees. Let’s add them:
As you may see, just a little cyan in the southeast mostly along the road. Here’s where you can see the trees occluding our view of the viewshed a bit. But, it’s a first good stab, even with such boring results… . I’ll have to get that section of road in here that peeks out over the gorge. But first, I’ll have to see if I can get tree stem locations from the lidar, so we can trade up for some veracity in our analysis. Stay tuned.