Soil and Plants emit light ?
From the attached article:
“After five years, however, the plants growing over buried body suddenly reflect light instead of absorbing light. In fact, on-grave plants reflect more than twice the green light of off-grave plants. For a human eye detecting such tiny changes would be “very hard,” said Kalacska, but the difference is obvious to the hyperspectral camera.”
This is light that is emitted (reflected) in a spectrum that is beyond that seen by the human eye - that is, hyper-spectral.
Fascinating article. I’d love to have this technology to examine sites in my state, which is full of small private forgotten graveyard, and long-lost church sites.
It would be great for finding old Civil War battlefields or finding corpses of crime victims.
The Arborvitae and grass in this infrared shot are actually dark green.
