Why do the following features appear as they do in this thermal infrared image:1. Roads - Road surface retains heat and black asphalt shows whiter - perfect radiator and absorber.
2. Natural and man-made vegetation - depending on water content will be cooler (darker) than surrounding areas. Trees cool surrounding area when leafy.
3. Sidewalks and patios - concrete is warmer and retains this warmth overnight better than ground surfaces and therefore whiter.
4. Storage sheds in back yards - little heat producing inside and therefore will be cooler than houses. At this time of the morning, would have little to no activity to emit heat.
5. Automobiles - autos not driven overnight would be cool (dark) and those that had been run recently would show a hot spot where the engine is located.
6. Bright spots on many roof tops - fireplaces, skylights, heat vents; would all cause a hot spot or bright area on the roof.
Think about the storage shed roof rather than the activity inside.
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