Good luck to them, I was hired for a tree survey once, really didn't go well. Never got an answer when I knocked and it wasn't until the last week of the assignment that I thought to started calling all the entries under "Woods" in the phone book. Must've dropped the survey questions somewhere too so I had to make those up on the spot once I finally got someone on the line.
So anyway, got fired from that job. Can't imagine what it takes to succeed in that field but I hope they have an easier time.