Imagery in the infrared (IR) part of the spectrum is based upon thermal emissions arising from the surface of the Earth, clouds and the atmosphere itself. Use of detectors sensitive to such emissions enables "thermal images" to be acquired both by day and by night. This is important for meteorology and many other disciplines because it enables cloud cover and surface temperatures to be monitored continuously. Infrared imagery is usually displayed so that the very coldest objects, such as high clouds, ice and snow, are represented by white or light tones. Warmer objects, such as low clouds and the surface of the Earth, are shown as shades of gray. Hot deserts by day will generally appear very dark or black, moderating to lighter gray shades in the cool of the night.
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