Heat signatures in inanimate objects such as trees, rocks and man made structures are attained by absorbing heat from the sun. Living things such as humans and animals create their own heat internally, as do vehicles and aircraft. Because different materials absorb and lose heat at different rates, they render a distinct pattern and signature when rendered through a thermal imager. As a device, thermal imaging binoculars are as usable during the day as they are at night time.
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