I presented the simple survey option to the Footers. Single engine cessna, with 45 degree camera angle, with look down FLIR video, you then go back to the office and watch the video, counting the number of Bigfoots on the video.
This is how they survey Elk, Deer and other large animals.
The Cessna would be too loud the Footers said. As the deer and elk on the video stand perfectly still unaware that the plane several thousand feet away is even near them.
Article about the simple survey method
http://visionairresearch.com/wp-cont...ofessional.pdf