I worked for a company called Northern States Aviation a few years back. Within the next month they will be looking for people for this coming season. It's a decent outfit. It's all in a C172, but I gained 600hrs in 7 months. They require 500TT. See Northern States Aviation, Aerial Survey, Reliable Airborne Platforms, Imaging, Sensing,. Other companies collecting images for the same contractor were Land Care, Air America, and Desert Winds. Not sure if that's changed since I did it.