Would have thought that Fire Spottig and Aerial Survey require 2 completely dfferent aircraft.
The Aerial Survey companies all seem to use 400 series Cessnas and the odd Chieftain for the Photography - have even seen a Bongo
Fire Spotting seems to be done (by CALM WA and a few others) in Decathlons, Super Cubs, C172s, Bird-Dogs... long loiter time (not so long in the C305)