posted on Jan, 13 2013 @ 01:12 AM
reply to post by intrptr
Oh, I'm just condescending to those who post information that is catigoricly false, claiming it is fact and thinking that what they saw on Predator
or CSI is what happens in the real world spouting it off to sound all knowledgeable.
When something moves in the water it disrupts the thermal boundary layers and an obvious thermally contrasting wake or disturbed area is left, even if
the person/animal is below the surface. Operators (at least good ones) are trained to recognize this. Also, as soon as you pop your head up, it's a
bright hot spot in the middle of a (generally) featureless scene.
Of course as always there are things you can take advantage of. If the observer's perspective is at a point where your position is in the reflection
of the shore features your thermal image can be significantly obscured. This is because water is both emissive and reflective in the thermal infrared
portion of the spectrum. This means that the temperature of objects reflected in the water is added to the temperature of the water itself and so
appear much hotter than they actually are when viewed directly. Because most shorelines are lined with trees, the reflected shore image creates a high
temperature, highly mottled scene, acting somewhat like camouflage.
edit on 13-1-2013 by dainoyfb because: of more typos.