Atmospheric windows used for remote sensing are 0.4-1.3; 1.5-1.8; 2-2.26; 3-3.6; 4.2-5.0; 7-15.0 µm and 10 mm—10 cm wavelengths regions of electromagnetic spectrum. EMR is a dynamic form of energy that propagates as wave motion at a velocity of c = 3 x 1010 cm/sec. Remote sensing uses a part or several parts of the electromagnetic spectrum. All electromagnetic waves travel throughspace at the same speed, c = 2.99792458 x 108m/s, commonly known as … This theory describes the EM energy as travelling in a harmonic sinusoidal fashion at the velocity of light. Remote sensing data is useful in obtaining up-to-date land use pattern of large areas at any given time and also monitor changes that occur from time to time. Electromagnetic radiation and Electromagnetic spectrum. Progressive stages in remote sensing are as follows: At temperature above absolute zero, all objects radiate electromagnetic energy by virtue of their atomic and molecular oscillations. The fundamental unit of electromagnetic phenomena is the photon, the smallest possible amount of electromagnetic energy of a particular wavelength. There are several regions of the electromagnetic spectrum which are useful for remote sensing. Feb 1, 2017 - Resources for teaching about satellites, the electromagnetic spectrum and different kinds of images used to better understand our world. The energy is: The image is then interpreted to extract the informations about target. It records the electromagnetic energy reflected or emitted by the earth’s surface. 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. Most common remote sensing systems operate in one or several of the visible, infrared and microwave portions of the electromagnetic spectrum. Remote sensing is the use of electromagnetic energy to measure the physical properties of distant objects. DMPQ- “The revolt of 1857 led to far-reaching changes in the system of administration and the policies of the British government.” Elucidate. Published Sep 17, 1999. 618 0 obj <>stream %%EOF DMPQ- Trace the popular rise of Bhakti movement in medieval India. The electromagnetic radiation is the foundation for radar, which is used for guidance and remote sensing for the study of the planet Earth. Remote sensing uses a part or several parts of the electromagnetic spectrum. The total amount of emitted radiation increases with the body’s absolute temperature and peaks at progressively shorter wavelengths. Sensors detect and measure electromagnetic energy in different portions of the spectrum. 597 0 obj <> endobj • The whole range of EMR is called spectrum. electron acceleration coincides with z-axis x-axis y-axis Kinks in E-field caused by electron accelerations along z-axis radiate outward as EM waves ⊥ the x-y plane. electromagnetic spectrum –. Other applications are in cooking food (microwave oven), in … Electromagnetic spectrum, the entire distribution of electromagnetic radiation according to frequency or wavelength.Although all electromagnetic waves travel at the speed of light in a vacuum, they do so at a wide range of frequencies, wavelengths, and photon energies. After recording of energy, the resulting set of data is transmitted to the receiving station. It can be used to study deforestation, degradation of fertile lands, pollution in atmosphere, desertification, eutrophication of large water bodies and oil spillage from oil tankers. Electromagnetic spectrum used in remote sensing Microwave: The spectral range of near IR and short wave infrared is sometimes called the reflective infrared (0.7-3 m) because the range is more influenced by solar reflection rather than the emission from the ground surface. Remote sensing, also called earth observation, refers to obtaining information about objects or areas at the Earth’s surface without being in direct contact with the object or area. Detection and discrimination of objects or surface features means detecting and recording of radiant energy reflected or emitted by objects or surface material. On the other hand, hyperspectral platforms (e.g., Hyperion) can capture hundreds of bands on the electromagnetic spectrum. Electromagnetic remote sensing Instrument addressing electromagnetic radiations are sensitive to different wavelength ranges of radiations: ranging from gamma- and X-rays, up to microwaves. This information is used by regional planners and administrators to frame policy matters for all-round development of the region. Abstract : Remote sensing is a technique to observe the earth surface or the atmosphere from out of space using satellites (space borne) or from the air using aircrafts (airborne). h�b```a``�a�``0abf@ afV�,�7 ������AS��ܙ�g,dH����|Ό��{=TMD�+���}K����ÆC?V�Dĭ���>&��9���֏w$�..H�ؒ������h�� ���������V�V� �Ѐ� ˜AP9�. It is also used to warn people about impending cyclones. The sun provides the initial energy source for much of the remote sensing of the Earth surface. This "spectrum" is a way of talking about natural energy: from x-rays and ultra-violet light (UV), through visible light, to infrared (IR) and microwaves-- see the figure below. There are two general types of accelerometers. Most passive systems used in remote sensing applications operate in the visible, infrared, thermal infrared, and microwave portions of the electromagnetic spectrum. The range of radio waves is between 30 kHz and 300 GHz in an electromagnetic spectrum. Also mention the important functions performed by the committee. RADAR (Radio Detection And Ranging) is the most common device used in Microwave Remote Sensing. Principles of Remote Sensing - Centre for Remote Imaging, Sensing and Processing, CRISP. Answer 1: The most obvious source of electromagnetic energy and radiation is the sun. There are two general types of accelerometers. The room linked to this resource is not configured correctly. Electromagnetic Spectrum. The Remote Sensing is basically a multi-disciplinary science which includes a combination of various disciplines such as optics, spectroscopy, photography, computer, electronics and telecommunication, satellite launching etc. Although, the remote sensing includes a wide array of technologies and types, but they all are based on certain common concepts with the same basic components. • EMR is a dynamic form of energy. Remote sensing technologies rely on a variety of electromagnetic energy. 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