Rick: Me; - being a retired P. Eng. -I lay track like I was building it and I was paying for it! I move the track to suit the terrain. Not the data from the topo maps, or the blue-green line from the track vector data (TransDEM input) because those data are for paper maps.
I've seen many TransDEM routes where the track runs along a valley floor in what looks like a ditch because the track as TransDEM lays it out is flat and the route builder use 'smooth' to adjust the track. I fiddle the gradient as I go along the track to minimize the 'cuts' and 'fills' an imaginary construction crew would need.
The same with going around mountains :hehe:
A trite cliche: overworked but appropriate: "A picture is worth a-buncha-words"
The blue-green line is where the track was placed. I don't think that placement would work. Roller Coaster, anyone?
Also, the trouble is NOT with TransDEM. It puts the track, roads etc., where the data says, wrongly perhaps, it belongs. An "exact replica" of the route won't happen unless you use differential GPS and go and measure it. And <hehehe> are you going to account for the continent slowly sinking? :hehe:
Cheers,
--michael.
PS I'm still trying to get a beach like yours Rick. Got everything but the waves :'( :'(