Electromagnetic energy is the main source of energy for remote sensing. This energy is measured by wavelength or frequency. When this energy interacts with an object, it can be reflected, absorbed, or transmitted. Remote sensing is primarily concerned with measuring the reflected radiation. Electromagnetic radiation transfers energy in the form of waves or particles from a higher to lower energy state, and can be transferred through space or a medium like air. The energy of each photon is inversely related to its wavelength, so longer wavelengths have lower energy.

1. Presented by
Sandra Joseph
BSA-12-640

2.  Electromagnetic energy : the major source of energy for
remote sensing.
 This energy is commonly measured in wavelength and
sometimes in terms of the
frequency.

4. When the energy encounters an object,
the radiation will be
(1) reflected off the object
(2) absorbed by the object, or
(3) transmitted through the object.
The total amount of radiation that strikes an object is
referred to as the incident radiation, and is equal to:
reflected radiation + absorbed radiation
+transmitted radiation
In remote sensing, we are largely concerned with
REFLECTED RADIATION.

5.  radiation - a process in which energy is transmitted in the
form of waves or particles, by a body as it changes from a
higher energy state to a lower energy state.
 one of the 3 recognized modes of energy transfer.
 radiation is the most unique : it can be transferred through
free space and through a medium like air.

6.  The theory states that electromagnetic radiation is
composed of many discrete units called photons or quanta
and that the energy of a quantum is inversely proportional to
its wavelength.
 That is, the longer the wavelength involved, the lower its
energy content.
 This implies that systems operating at long wavelengths
must view large areas of the earth at given time so as to
obtain a detectable energy signal.

7. This law states that,
the higher the temperature of the radiator, the greater the
total amount of the radiation it emits.
the amount of energy radiated is directly proportional to the
temperature of the body radiating it.

8.  Basic principles of remote sensing – B.C .Panda
 www.r-s-c-c.org