Checked out my section of the Appalachian Trail corridor yesterday during a snow shower. Really wasn't too cold, as long as we kept moving. The secret is to find these survey markers. Generally the yellow paint on the trees will help you find them, but sometimes you need to bushwhack through the woods with a compass to find them.
See this paper to learn more about monitoring:
Bristow, Robert S. 1988. "Volunteer-based recreation land management." Parks & Recreation. Vol 33 no 8, pp 70(7)
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