17. Infrared aerial photo

http://www.outintheboonies.com/Arbuckle_Tract/

Infrared film captures images that are both visible and invisible on the electromagnetic spectrum.
IR aerial photos are obtained by satellites, high altitude aircraft and are useful for looking at vegetation patterns, environmental pollution, effect of human activities and study land form. This is important because without this technology, we would not be able to see the Earth outside of its natural colors, because IR light is outside of our visible range. The wavelengths that infrared aerial film record gives scientists a better understanding of the Earth's surface, and contrasts land/water clearer.