كتاب اساسيات الاستشعار عن بعد ونظم المعلومات الجغرافية
Basic Remote Sensing and GIS
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The wavelength and frequency are two characteristics of electromagnetic radiation which are particularly important for understanding remote sensing and the information to be extracted from
remote sensing data.
The wavelength is the length of one wave cycle, which can be measured as the distance between successive wave crests. It is represented by the Greek letter lambda ( ). It is measured in meters (m) or some factor of meters such as nanometers (nm, 10-9metres), micrometers (10-6metres) or centimeters (cm, 10-2metres).
Frequency refers to the number of cycles of a wave passing a fixed point per unit of time. It is measured in hertz (Hz), equivalent to one cycle per second, and various multiples of hertz.
Wavelength and frequency of electromagnetic energy are inversely related to each other. The shorter
the wavelength, the higher is the frequency and the longer the wavelength, the lower is the frequency. The following equation provides the relationship between wavelength and frequency of
electromagnetic energy.
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