Section 1.2 Electromagnetic Radiation /Rotate 0 What is electromagnetic radiation (EMR)? However any media such as gravity or magnetic fields can be utilized in re-mote sensing. 1. The energy waves vary in size and frequency. <> The passive sensors utilize the energy from the sun for its activities, while the active ones generate their energy for the sensing process. X9�XE��Y�D�Ж�l�C6�%�B?�^�~&��s�g�I_ofϙ�$'���p������,礀����sR���l�(�^gHWkx�"\��u��G�d9['+]�y�%�G�|5[�}���)ສ�>C In this sense, incident solar radiation can follow three pathways: it can be transmitted, reflected, or absorbed. Remote Sensing “What is Remote Sensing?” Remote sensing defined: “… is the measurement or acquisition of some property of an object or phenomenon, by a recording device that is not in physical contact with the object or phenomenon under study (formal definition of the ASPRS ) Remote sensing is both an art and a science.” Keywords: •acquiring, •processing, and •interpreting The principles of remote sensing are based primarily on the proper-ties of the electromagnetic spectrum and the geometry of airborne or satellite platforms relative to their targets. Good absorbers are good emitters on the basis of kirchhoffs radiation law al can be replaced with el. << • The whole range of EMR is called spectrum. 1 0 obj Fig. 1.1 What is Remote Sensing? 5 1.2 Electromagnetic Radiation 7 1.3 Electromagnetic Spectrum 9 1.4 Interactions with the Atmosphere 12 1.5 Radiation - Target 16 1.6 Passive vs. /Length 3522 This involves the detection and measurement of radiation of different wavelengths reflected or emitted from distant objects or materials, by … When electromagnetic radiation travels through the atmosphere, it may be absorbed or scattered by the constituent particles of the atmosphere. Such energy propagation is called the Electromagnetic Radiation (EMR). Primarily a textbook for graduate courses in electrical engineering, Electromagnetic Wave Propagation, Radiation, and Scattering is also ideal for graduate students in bioengineering, geophysics, ocean engineering, and geophysical remote sensing. Download Free PDF. Hence, it is essential to understand the effects of atmosphere on the electromagnetic radiation travelling from the Earth to … Electromagnetic radiation is a phenomenon that takes the form of self-propagating energy waves as it travels through space (vacuum or matter). Nuclear reactions within the sun produce a full spectrum of electromagnetic radiation. Nuclear reactions within the sun produce a full spectrum of electromagnetic radiation. Sensors 2.1 On the Ground, In the Air, In Space 34 /Type /Catalog )���-�>R�s-�}���59�/R����O�����5��p�����d�?R�՚��G [/PDF /Text /ImageB /ImageC ] • In remote sensing of the earth, the sensor is looking through a layer of atmosphere separating the sensor from the Earth's surface being observed. 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