Remote sensing involves the measurement of energy in many parts of the electromagnetic (EM) spectrum. Both have the same amplitude at the same time. Remote Sensing is a set of multidisciplinary techniques and methodologies that aim at obtaining information about the environment through “remote” measurements. Electromagnetic radiation is generated whenever the electrical charge is accelerated. Next we will be examining the way in which we categorize electromagnetic radiation for just that purpose. Hospitals use imaging technology, including CAT scans, magnetic resonance imaging (3-D imaging of soft tissue), and x-rays for examining our bodies. Passive remote sensing refers to the sensing of electromagnetic waves that did not originate from the satellite or instrument itself. The remote sensing device that we humans use to detect radiation from the sun is our eyes. Express your answer in micrometres(μm). Different objects return different amount of energy in different bands of … You will not receive a reply. Energy Sources and Electromagnetic Radiation Two characteristics of electromagnetic radiation are particularly important for understanding remote sensing. [Text Version] The wavelength is the length of one wave cycle, which can be measured as the distance between successive wave crests. These devices are sensitive to the wavelengths ranging from 300 nm to 3000 nm. The goal of this article is to provide an introduction to the basics of satellite remote sensing with a special focus on the principles, characteristics, analysis, and applications of remote sensing data acquired in different parts of the electromagnetic spectrum. Active remote sensing systems emit radiation on the study object and measure the reflected amount of radiation. Sensor is an electronic circuit which can record the electromagnetic radiation incident upon it. Remote sensing systems are divided into two groups based on separate technical solutions. The vital concepts of spatial resolution and detection are explained using the eye as an example of remote sensing system. Remote sensing instruments are of two primary types—. Two characteristics of electromagnetic radiation are particularly important for understanding remote sensing. Summary Remote sensing is the measurement and recording of the electromagnetic radiation emanating from the earth’s environment by sensors mounted on a platform at a vantage point above the earth’s surface. Frequency is normally measured in hertz (Hz), equivalent to one cycle per second, and various multiples of hertz. Print. These are the wavelength and frequency. Active sensors, provide their own source of energy to illuminate the objects they observe. electromagnetic radiation). ...that remote sensing, in its broadest definition, includes ultrasounds, satellite weather maps, speed radar, graduation photos, and sonar - both for ships and for bats!. Electric and magnetic fields obey the properties of superposition so that a field due to any particular particle or time-varying electric or magnetic field will contribute to the fields present in the same space due to other cau… The first requirement for remote sensing is an energy source which can illuminate a target. Remote sensing provides a synoptic view that carries a continuous record of the environment that is consistent. active and passive. Characteristics as Wave motion: EMR can be considered as a transverse wave with an electric field and a magnetic field, located at right angles to each other. • The whole range of EMR is called spectrum. 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). The wavelength and frequency are the two important characteristics of this electromagnetic radiation. What "remote sensing device" do you personally use to detect this energy? Remote sensing is the science and art of identifying, observing, and measuring an object without coming into direct contact with it. These sensors measure land and sea surface temperature, vegetation properties, cloud and aerosol properties, and other physical properties. For most purposes, the ultraviolet or UV portion of the spectrum has the shortest wavelengths which are practical for remote sensing. All matters reflect, emit or radiate a range of electromagnetic energy, depending upon the material characteristics. 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