Remote sensing Essay Example | Topics and Well Written Essays - 1500 words

Remote sensing - Essay Example 239) have defined the remote sensing as a field of science or art that makes use of energy reflected from the Earth that is later processed, evaluated and applied in order to assist one in retrieving information regarding the surface of Earth without physically having to be on it. Sun is the fundamental source of energy for all the creatures on earth. Sun rays falling on earth are partly reflected which are captured by the satellites for generating information. The first condition without which, the process of remote sensing can not take place, is the provision of electromagnetic energy as waves to a specific place or to a study area. Although there are many electromagnetic energy sources, yet the sun is fundamentally the best source of energy. Basically, the energy travels from a source to a target through a medium or vacuum. When it comes to the earth, the energy interacts with the atmosphere, and this interaction gets repeated when the energy is reflected from the study area to the sensor. After the electromagnetic waves have passed the atmosphere from some source, they interact with the study area. This interaction depends on the characteristics of the study area and also on the electromagnetic radiation sent to it. After the electromagnetic waves interact with the study area, part of them is absorbed and the rest is reflected back to the space. Recording and collecting the reflected electromagnetic waves requires a special type of sensor which is familiar with the reflective waves. The last step of this operation is to understand, disclose and apply the information that has been retrieved from the study area. The problem can be solved by conducting its comparison with the real information. In 1864, the British physicist Clark Maxell predicted the existence of electromagnetic waves and supposed that the magnetic and electric fields work together to produce radiant energy. In addition to that, he described the visible light to be composed of