I saw a USGS truck today with the strangest aerial antenna mounted to the roof today.He was stopped just around the corner from the house.I would have liked to talk to him for a min but I had to run my dad to the Dr's.I'm wondering how they get their readings,mainly because of a elevation issue I have on the backside of my pond.Chances are it is part of the Sandy mapping project http://www.usgs.gov/newsroom/article.asp?ID=3666 .I'm a little nervous about the remapping but oh well.