• The foundation of remote sensing technology is based on the measurement and interpretation of the patterns of EMR. endobj Interaction of Electromagnetic Waves with Matter: Quick Overview. B. << Remote sensing is the science and art of identifying, observing, and measuring an object without coming into direct contact with it. 2. All matters reflect, emit or radiate a range of electromagnetic energy, depending upon the material characteristics. 7 0 obj 3 0 obj It consists of both electric and magnetic field components. 4 0 obj This energy is in the form of electromagnetic radiation. stream Fig. 2 0 obj wave theory of radiation has been developed extensively It impacts on remote sensing in. Remote sensing imagery has … Transcription. 8깂�G Remote sensing is the science and art of identifying, observing, and measuring an object without coming into direct contact with it. Different Sensors 2.1 On the Ground, In the Air, In Space 34 �̖*�D %PDF-1.2 The electromagnetic spectrum is the term used to describe to entire range of all possible frequencies of electromagnetic radiation. ... Optical remote sensing depends on solar radiation as the source of illumination. Black body radiation remote sensing. Remote sensing system that measures naturally available energy is called a passive sensor. Visible light is just one of many forms of electromagnetic energy. Fundamental Properties of Electromagnetic Waves. endobj 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). >> Spectral emissivity of an black body object equals its spectral absorbance. EMR transmit cross space in the wave form and in the speed of light. 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). Overview of Remote Sensing Major Objective of Remote Sensing Detect, measure, record and analyze energy radiated in selected wavelengths of the electromagnetic spectrum Gamma Rays X-Rays UV Visible Reflective Infrared Thermal Infrared Microwave B G Y O Near IR Middle IR 0.4 0.7 m 1 m µ 5 31 V R The distinctive character of electromagnetic 1.1 What is Remote Sensing? endobj /Type /Catalog The energy waves vary in size and frequency. 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. The stored data can often be transformed into an image by a computer using dedicated software. coefficient of the object and its spectral variation and thus on the nature of the object. We mention how electromagnetic radiation is used actively for radio communications with Earth-orbiting satellites and passively for remote sensing investigations not … /Fcpdf4 58 0 R endobj A device to detect the electromagnetic radiation reflected or emitted from an object is called a “remote sensor” or - “sensor”. Electromagnetic radiation • All bodies with a temperature above –273 °C (0 °K) emit energy • A blackbody reflects no radiation. C. Neutral remote sensing. 4 0 obj endobj Electromagnetic radiation is a phenomenon that takes the form of self-propagating energy waves as it travels through space (vacuum or matter). The reflection of sunlight from vegetation will give information on the reflection. 5 0 obj 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. /Fcpdf2 56 0 R 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. Some remote sensors are passive while others are active. The passive sensors utilize the energy from the sun for its activities, while the active ones generate their energy for the sensing process. >> $�A��]+4q�_�@E�ʲ//����#���|�T�q�$3R�S���&�@#H�� 9�����حt?�l;�������l���ČL?L�+��糗Z��\���Q'H8�o���ۏN0���+������W�a�V�IR'�����׏�?ߠ��bL?�1 �#���]�7��#6>�j�H��2�AC�z���� �����É�����#�H��F{p�@6Zj��~l��gnf3wo�8����������p{�\�r�i��g�S��O J����^�V2���/�_��!�E>c�G�o ��V��>��1P�2�L}�MBGvdcu2�ҏ5�{�l. Sources of Electromagnetic Radiation Remote sensing uses EMR from both natural sources and artificial sources. In this sense, incident solar radiation can follow three pathways: it can be transmitted, reflected, or absorbed. When electromagnetic radiation travels through the atmosphere, it may be absorbed or scattered by the constituent particles of the atmosphere. The output of a remote sensing system is usually an image representing the object being observed. x�%nR�՚��'\��4�H��$��R���ܬ��Z��C 6 0 obj This energy for remote sensing instruments is in the form of electromagnetic radiation (EMR). /Type /Pages The use of sound is an obvious alternative; thus you can claim that your telephone conversation is indeed 'remote sensing'. The Earth s atmosphere absorbs, scatters, and emits electromagnetic radiation. /Rotate 0 PRINCIPLES OF REMOTE SENSING. 4.1. Which one of the following quantities forms the basis of radiometry? • Core principles of electromagnetic radiation (EMR) – solar radiation – blackbody concept and radiation laws • EMR and remote sensing – wave and particle models of radiation – regions of EM spectrum – radiation geometry, terms, units – interaction with atmosphere – interaction with surface Remote sensing: principles, electromagnetic spectrum, components and applications. • EMR is characterized by wavelength and frequency. This chapter provides a background on the physics of remote sensing, including discussions of energy sources, electromagnetic spectra, atmospheric Molecular absorption converts the radiation energy into excitation energy of the molecules. This involves the detection and measurement of radiation of different wavelengths reflected or emitted from distant objects or materials, by … Active Sensing 19 1.7 Characteristics of Images 20 1.8 Endnotes 22 Did You Know 23 Whiz Quiz and Answers 27 2. >> This involves the detection and measurement of radiation of different wavelengths reflected or emitted from distant objects or materials, by … Remote sensing techniques are powerful tools for spatial data acquisition and this course will describe the history, challenges and developments in remote sensing. Nuclear reactions within the sun produce a full spectrum of electromagnetic radiation. >> Electromagnetic radiation spectrum Remote sensing involves the measurement of energy in many parts of the electromagnetic (EM) spectrum. Remote sensing imagery has … << Detection of Electromagnetic Radiation. /CropBox [0 0 612 792] endobj >> Shefali Aggarwal. Lesson #1: Remote Sensing and the Electromagnetic Spectrum Introduction/Rationale Students have seen rainbows in the sky, on a soap bubble, or even from the spray of a garden hose. In earth and space science electromagnetic radiation is often a part of a ... satellite remote sensing visible 4-7 x 10-7 7.5x1014-4.3x1014 vibrating atoms or electron transitions about 1/40 of total Optical imaging is the widely used passive remote sensing. 3.3.2.2 Electromagnetic Radiation. /Resources << <>>> And, everything illumined by our sun reflects radiation. stream /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 ] – Canadian Center for Remote Sensing Electromagnetic energy may be detected either photographically or electronically. characteristics of electromagnetic radiation in terms of their wavelength and frequency is crucial to understanding the information to be extracted from remote sensing data. 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. green trees etc, Microwave radiation transmitted from a radar system and scattered from a rain cloud. Introduction To Remote Sensing energy at a speed of light (300,000 km per second). • History of remote sensing – important mile stones • Basics of radiation theory, wavelength bands and false color composites • Theory and technique behind: aerial photographs, digital photographs, digital sensors/scanners • Digital image processing techniques • Key … electromagnetic radiation. The information is acquired through electromagnetic radiation, force fields or acoustic energy using different types of remote sensors that can either be active or passive [4]. D. None of these. They should already possess an understanding that white light is the combination of all colors of the spectrum. Remote sensing systems based on electronic radiation detectors are not obviously image generating systems, that is, the result is not an image, but rather a set of numbers stored in a computer compatible format. Exercises. Sources of Electromagnetic Radiation Remote sensing uses EMR from both natural sources and artificial sources. 2 0 obj %���� the way that radiation is reflected at a surface and transmitted absorbed and scattered in a. Remote sensing visual information 2-1 Introduction. 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. 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. 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