Thermal Camera FOV

I was curious if there are guidelines for thermal cameras being utilized for detection related to the FOV coverage areas and PPF categories similar to standard cameras (Detection, Observation, Recognition, Identification, Inspection) and what those approximate PPF values are for. I realize that you are trying to both detect objects and be able to discern between temperatures as part of this, but what are the guidelines for determining how much area a thermal camera can effectively operate in?

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