What is the principle of infrared remote sensing?

Remote sensing technology that uses infrared remote sensors (such as infrared cameras and infrared scanners) to detect the difference information of infrared characteristics reflected or radiated by distant vegetation and other ground objects, so as to determine the nature, state and changing law of ground objects.

Any object has spectral characteristics, specifically, they all have different absorption, reflection and radiation spectral characteristics. In the same spectral region, various objects reflect different situations, and the same object also reflects different spectra. Even the same object will have different reflection and absorption spectra at different times and places due to different angles of sunlight.

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U-2 aircraft is equipped with a high-resolution camera system, which can obtain high-resolution and clear images of ground targets, and its reconnaissance range can reach a large area with a depth of tens of kilometers along the flight route, providing extremely intuitive and accurate information for command organs and combat troops.

The armed forces of the United States, Britain and France have always attached great importance to the development of this advanced tactical airborne imaging reconnaissance and surveillance system. From the Vietnam War to the Persian Gulf War, the US Navy alone has more than 500 reconnaissance planes, and there are still more than 100 ghost reconnaissance planes serving all over the world.

References:

Baidu Encyclopedia-Infrared Remote Sensing