Although many characteristics of EM energy are easily described by wave theory, another theory known as particle theory offers insight into how electromagnetic energy interacts with matter. It records the electromagnetic energy reflected or emitted by the earth’s surface. It suggests that EMR is composed of many discrete units called photons/quanta. Remote sensing uses a part or several parts of the electromagnetic spectrum. The amount of radiation from an object (called radiance) is influenced by both the properties of the object and the radiation hitting the object (irradiance). 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. This depends on the property of material (structural, chemical, and physical), surface roughness, angle of incidence, intensity, and wavelength of radiant energy. DMPQ- Trace the popular rise of Bhakti movement in medieval India. DMPQ- Give historical background of Public account committee. Published Sep 17, 1999. Photons, which are without mass, move at the speed of light—300,000 km/sec (186,000 miles/sec) in the form of waves analogous to the way waves propagate through the oceans. These sensors measure land and sea surface temperature, vegetation properties, cloud … Passive remote sensors include the following: Accelerometer—An instrument that measures acceleration (change in velocity per unit time). The energy used in remote sensing of the earth comes from the sun. It records the electromagnetic energy reflected or emitted by the earth’s surface. Radio waves are electromagnetic waves that have wavelengths longer than infrared radiations. Answer 1: The most obvious source of electromagnetic energy and radiation is the sun. (See Jensen, Remote Sensing of the Environment: An Earth Resource Perspective, Second Edition, Aerial Photography Filtration pages 97-98). In remote sensing analysis, similarities and differences among the spectral signatures of individual pixels are used to establish a set of more general classes that describe the landscape or help identify objects of particular interest in a scene. The absorbed radiation is later emitted by the material at a different wavelength. displacement (and hence no electromagnetic wave). Electromagnetic Waves. MPPSC Prelims and Mains Notes, MPPCS Test Series, Remote sensing: principles, electromagnetic spectrum, components and applications. The energy E of a photon is proportional to the wave frequency f, E = h f 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. Remote sensing: principles, electromagnetic spectrum, components and applications. There are two general types of accelerometers. 618 0 obj <>stream Electromagnetic remote sensing Instrument addressing electromagnetic radiations are sensitive to different wavelength ranges of radiations: ranging from gamma- and X-rays, up to microwaves. Photons According to quantum physics, the energy of an electromagnetic wave is quantized, i.e. Feb 1, 2017 - Resources for teaching about satellites, the electromagnetic spectrum and different kinds of images used to better understand our world. For most purposes, the ultraviolet or UV portion of the spectrum has the shortest … Detection and discrimination of objects or surface features means detecting and recording of radiant energy reflected or emitted by objects or surface material. EMR transmit cross space in the wave form and in the speed of light. 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. The remote sensing device that we humans use to detect radiation from the sun is our eyes. Also mention the important functions performed by the committee. Electromagnetic spectrum: The electromagnetic spectrum ranges from the shorter wavelengths (including gamma and x-rays) to the longer wavelengths (including microwaves and broadcast radio waves). electromagnetic spectrum –. 609 0 obj <>/Filter/FlateDecode/ID[<6D234F43F44E12429B0270812E020609>]/Index[597 22]/Info 596 0 R/Length 77/Prev 1041986/Root 598 0 R/Size 619/Type/XRef/W[1 3 1]>>stream Remote sensing uses a part or several parts of the electromagnetic spectrum. Visible and infrared wavelengths are most commonly used in remote sensing of land features, while visible light alone is normally used in the remote sensing of water bodies. The sun, being a major source of energy, radiation and illumination, allows capturing reflected light with conventional cameras and films. The parameters that characterize a wave motion are wavelength (λ), frequency (ν) and velocity (c). 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. h�bbd```b``��`� ,rLւH�V����"�����@���* �q=#�� �D�����0 .= This theory describes the EM energy as travelling in a harmonic sinusoidal fashion at the velocity of light. They should already possess an understanding that white light is the combination of all colors of the spectrum. 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. 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. Different �3�A�A���I�K���|������3���zH�. For example, the first two Landsat satellites use a multi-spectral scanner (MSS) and captured images using four spectral bands (green, red, and two near-infrared bands). On the other hand, hyperspectral platforms (e.g., Hyperion) can capture hundreds of bands on the electromagnetic spectrum. z-axis (x-y plane) 1 kinked E-field line Instantaneous E pattern Prof. Raymond Lee; SO431; EMR basics for remote sensing Remote sensing uses sensors that measure parts of the electromagnetic spectrum. 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