Spectral emissivity of an black body object equals its spectral absorbance. Everything emits electromagnetic radiation. Shefali Aggarwal. In remote sensing, the sun is the most obvious source of EMR (solar 3.3.2.2 Electromagnetic Radiation. Remote sensing system that measures naturally available energy is called a passive sensor. EMR transmit cross space in the wave form and in the speed of light. 3.1 Electromagnetic Radiation Remote sensing requires energy source to illuminate the target. Fundamentals of Remote Sensing 1.2 Electromagnetic Radiation As was noted in the previous section, the first requirement for remote sensing is to have an energy source to illuminate the target (unless the sensed energy is being emitted by the target). Electromagnetic radiation • All bodies with a temperature above –273 °C (0 °K) emit energy • A blackbody reflects no radiation. x��ZYo�H~7���GraQ�W�gֳq����$�DI\X���ld~�VU7)6���� 6���:�:�釺-�ټu޿�~h�l��Ώ�z�5��~Χ߲UQfmQ������k�jv~6�Ĝ�O#g�s?�҉�ȏg�9?������{�I7�&L���n�MB��o"�|��ҋ�ƛ$nQz鮼_����8��a"�Y2�� W��cd���Z�p$�nV?����W�$v���;����9^=�����/�Ɍc[�$~��6 �0>m� ��h�N�9 /Outlines 2 0 R �o�$���v�%��K5^�jh��j��s�D�28�Թ��v��^Um[m�v�Q��R���Y�J�/c� Remote sensing imagery has … Electromagnetic radiation is the very basis for remote sensing technology. The Earth s atmosphere absorbs, scatters, and emits electromagnetic radiation. Fig. /Fcpdf0 54 0 R << Sun which represents the initial source of most of the electromagnetic energy recorded by remote sensing systems (except radar). Active remote sensing. endobj Electromagnetic radiation which is reflected or emitted from an - object is the usual source of remote sensing data. ��Z�O�kf�)������IV���gY�iV����YWk(N`�G�I�Q�#>)�}�Aq+�j �I���q+�j �i���5����cF�)�>jL�O�puP�� Different ... very high spatial resolution sensor system 28 Principles of Remote Sensing ELECTROMAGNETIC RADIATION AND THE ELECTROMAGNETIC SPECTRUM EMR is a dynamic form of energy that propagates as wave motion at a velocity of c = 3 x 1010 cm/sec. <> More specifically, all objects with a temperature above absolute zero emit radiation.Because radiation can transport energy even without a medium, it is the only way in which the earth interacts with the rest of the universe. 6 0 obj Electromagnetic radiation which is reflected or emitted from an - object is the usual source of remote sensing data. 2 0 obj /Count 0 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 Introduction To Remote Sensing energy at a speed of light (300,000 km per second). <>>> Remote sensing techniques are powerful tools for spatial data acquisition and this course will describe the history, challenges and developments in remote sensing. The detection of electromagnetic radiation via remote sensing has four broad compo-nents: a source of radiation, interaction with the atmosphere, interaction with the earthÕs surface, and a sensor (see Figure 1.1). Remote Sensing and GIS Applications in Agriculture. Fundamentals of Remote Sensing 1.2 Electromagnetic Radiation As was noted in the previous section, the first requirement for remote sensing is to have an energy source to illuminate the target (unless the sensed energy is being emitted by the target). They should already possess an understanding that white light is the combination of all colors of the spectrum. 3 0 obj /Fcpdf3 57 0 R 1. �ZS����51�? ... Everything emits radiation. • The foundation of remote sensing technology is based on the measurement and interpretation of the patterns of EMR. Transcription. /Length 3522 14. << >> This involves the detection and measurement of radiation of different wavelengths reflected or emitted from distant objects or materials, by … endobj Introduction To Remote Sensing energy at a speed of light (300,000 km per second). << characteristics of electromagnetic radiation in terms of their wavelength and frequency is crucial to understanding the information to be extracted from remote sensing data. In remote sensing various kinds of tools and devices are used to make electromagnetic radiation outside this range from 400 to 700 nm visible to the human eye, especially the near infrared, middle-infrared, thermal-infrared and microwaves. Black body radiation remote sensing. /Kids [ 6 0 R 8 0 R 10 0 R 12 0 R 14 0 R 16 0 R 18 0 R 20 0 R 22 0 R 24 0 R 26 0 R 28 0 R 30 0 R 32 0 R 34 0 R 36 0 R 38 0 R 40 0 R 42 0 R 44 0 R 46 0 R 48 0 R 50 0 R 52 0 R ] endobj /Count 24 It consists of both electric and magnetic field components. the way that radiation is reflected at a surface and transmitted absorbed and scattered in a. Which one of the following quantities forms the basis of radiometry? x�%nR�՚��'\��4�H��$��R���ܬ��Z��C B. The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called: A. Natural Sources of Electromagnetic Radiation All objects with a temperature above absolute zero (–273oC, 0K) emit EMR continuously. The Earth s atmosphere absorbs, scatters, and emits electromagnetic radiation. /Contents 7 0 R 1 0 obj • The whole range of EMR is called spectrum. /Differences [ 219 /Euro ] /Type /Outlines We mention how electromagnetic radiation is used actively for radio communications with Earth-orbiting satellites and passively for remote sensing investigations not … Generation of Electromagnetic Radiation. The passive sensors utilize the energy from the sun for its activities, while the active ones generate their energy for the sensing process. Passive remote sensing. 3.3.2.2 Electromagnetic Radiation. 4 0 obj nature of this region and its importance to remote sensing in Canada, an entire chapter (Chapter 3) of the tutorial is dedicated to microwave sensing. Trees etc, Microwave radiation transmitted from a rain cloud excitation energy the! Acquisition and this course will describe the history, challenges and developments in remote sensing energy at a speed light! 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