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
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“A German immersed in any civilization different from his own loses a weight equivalent in volume to the amount of intelligence he displaces.”
—José Bergamín (1895–1983)