EMS
Basic Principles of Remote Sensing
1.
Electromagnetic energy has been classified by wavelength and arranged to
form the electromagnetic spectrum.
2. As electromagnetic energy interacts with the
atmosphere and the surface of the Earth, the most important concept to remember
is the conservation of energy (i.e., the total energy is constant).
3. As electromagnetic waves travel, they
encounter objects (discontinuities in velocity) that reflect some energy like a
mirror and transmit some energy after changing the travel path.
4. The distance
(d) an electromagnetic wave travels in a certain time (t) depends on the
velocity of the material (v) through which the wave is traveling; d = vt.
5. The velocity
(c), frequency (f), and wavelength (l) of an electromagnetic wave are related
by the equation: c = fl.
6. The analogy
of a rock dropped into a pond can be drawn as an example to define wave front.
7. It
is quite appropriate to look at the amplitude of an electromagnetic wave and
think of it as a measure of the energy in that wave.
8. Electromagnetic waves lose energy (amplitude) as they travel
because of several phenomena
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