Infrared imagery

Definition
Infrared imagery is

"imagery produced as a result of sensing electromagnetic radiations emitted or reflected from a given target surface in the infrared portion of the electromagnetic spectrum (approximately 0.72 to 1,000 microns)."

Source

 * U.S. Department of Defense, Joint Pub. 1–02: DOD Dictionary of Military and Associated Terms (Apr. 2010) (full-text).