Passive remote sensing systems

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Passive remote sensing systems (as opposed to active FE systems ) record the solar radiation reflected from the earth's surface as well as the thermal radiation emitted by the earth's surface itself . Wide areas of the electromagnetic spectrum can be evaluated.

Examples of passive systems are:

• Measuring cameras and aerial photographs (for black and white or color images of the earth's surface)
• Multispectral scanner in the reflective spectral range (for capturing the spectral reflective properties)
• Thermal imaging cameras in the emitted spectral range (for recording surface temperatures)
• passive microwave radiometer (for recording soil moisture and ocean salinity).

See also:

• Earth observation
• Remote sensing