Geophysical Intelligence
(US Army Field Manual 2-0) defines geophysical intelligence as a branch of MASINT. "it involves phenomena transmitted through the earth (ground, water, atmosphere) and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and magnetic field or ionosphere disturbances."
Read more about this topic: National Technical Means Of Verification
Famous quotes containing the word intelligence:
“It’s easy to forget what intelligence consists of: luck and speculation. Here and there a windfall, here and there a scoop.”
—John le Carré (b. 1931)