3 ms·

What did you do with the pvc pipe?

• MostlyStable 2y ago
  if I had to guess, they were going to randomly selected locations, looking at the sky through the PVC pipe (presumably straight up), and seeing if it was obstructed by tree canopy or not, and then comparing to whether or not the satellite said there was tree cover in that location
  • bmsan 2y ago
    Exactly this. Specifically, how much error rates increased as you moved towards the treeline. The "am I looking straight up?" check was a washer hanging from the pipe by a piece of string.