IS MUCH SENSING SATELLITE

I. Definitions and Basic Concepts

Remote sensing is the science, technology and art data acquisition and data processing to record the interaction between electromagnetic energy to an object. In other words can be defined as the science, technology and art of obtaining information about an object, area, or phenomenon through the analysis of data obtained with an instrument without direct contact with the object, area, or phenomenon under review.

In general, remote sensing showed activity recording, observation and capture the phenomenon of objects or events from a certain distance. In Is Much far, the sensor does not directly contact with the object being observed. Conductor means that information needs to physically travel from the object to the sensor through the medium.

Tutorial on training is more limited remote sensing technology to obtain information on the Earth's surface (sea and land) by using a sensor on the satellite platform and Spaceborne (spacecraft).

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Electromagnetic Energy in Remote Sensing Satellite

Visible light is one of several forms of electromagnetic energy, radio waves, ultraviolet rays and X rays are also other forms of energy are prevalent.

Figure: Illustration of recording a variety of phenomena that exist on the surface using remote sensing technology.

Basically, all the energy is the same and perform in accordance with the basic theory of radiation waves. In Figure 1. demonstrated the basic theory of electromagnetic energy that moves in harmony with the sinusoidal shape of the speed of light c. Based on the concept of basic physics, the wave has the following general equation:

C  =  f  x  l

c  =  speed of light (3 x 108 m / sec)

f   =  frequency

l  =  wavelength

Picture: Electromagnetic waves with components including electrical sinusoidal wave (E) and magnetic sinusoidal wave (M).

In the satellite remote sensing, electromagnetic wave grouping most commonly used wavelength is placed in position in the electromagnetic spectrum (Fig. 2.).

Figure 2. electromagnetic spectrum

Name of the spectrum is usually used in the electromagnetic spectrum, such as infrared waves, radio waves, microwaves, and so forth. And the spectrum has no clear boundaries between one part of the spectrum with the spectrum of the next one .. Part of the visible spectrum ( 0.4 to 0.7 μm) on a logarithmic image is part of a narrow, has a sensitivity to the human eye

The nature of electromagnetic radiation more easily described by using the wave theory, but the interaction between electromagnetic energy with matter can be explained by the theory of particles. Particle theory states that electromagnetic radiation consists of several separate parts are referred to as photons. The relationship between the wave theory with quantum theory in the behavior of electromagnetic radiation can be explained by the following equation:

E  =  hc / l

So it can be said the longer the wavelength used the lower energy content.

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