I hadn't even considered the DEM error. I can totally see it now that you've pointed it out though. The data is impressive either way.

I've had luck in the past with simply averaging the positions from multiple receivers, since horizontal multipath error on its own is typically under a couple tens of meters and it's so hyperlocalized that multiple receivers can experience totally different conditions.

On an unrelated note, do you know if they plan to continue with the half palisade traverse after they complete the rest of the crest?