Typical transparent objects include plate glass and clean water. The authors gave a general review in current remote sensing platforms, including satellites, airborne platforms, UAVs, ground-based mobile and static platforms, sensor georeferencing and supporting navigation infrastructure, and provided a short summary of imaging sensors. Transmission spectrum of soda-lime glass with a 2-mm thickness. A laser rangefinder uses a laser beam to determine the distance between the sensor and the object and is typically used in airborne and ground-based laser scanning. Remote sensing is the science and technology by which the properties of specified objects, area, or phenomenon can be identified, measured, and analyzed without direct contact with them in order to make useful decisions. 117 0 obj<>stream A laser altimeter uses a laser beam to determine the altitude of an object above a fixed level and is typically utilized in satellite and aerial platforms. Some systems, such as SPOT 5, are also designed to acquire images in middle-infrared (MIR) wavelengths (1580–1750 nm). The Earth’s atmosphere strongly absorbs infrared and UV radiation. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. So far, more than 1000 remote sensing satellites have been launched. Satellites provided the ability to capture the first-ever commercial high-resolution video of Earth from a satellite and the ability to capture high-resolution color and near-infrared imagery, Monospectral, black and white, gray-scale image, Earth observation and reconnaissance applications, Red-green-blue (true color): visual analysis; Green-red-infrared: vegetation and camouflage detection; Blue-NIR-MIR: visualizing water depth, vegetation coverage, soil moisture content, and the presence of fires, all in a single image, (i) Agriculture; (ii) eye care; (iii) food processing; (iv) mineralogy; (v) surveillance; (vi) physics; (vii) astronomy; (viii) chemical imaging; (ix) environment, High applicability in (i) imaging multiple targets; (ii) mosaic strips to large area; (iii) stereo and tristereo acquisition; (iv) linear feature acquisition, such as coastlines, pipelines, roads, and borders, Affected by sun illumination and cloud coverage. The Bavarian Pigeon Corps took the first aerial photos using a camera attached to a pigeon in 1903. Most of the infrared radiation in sunlight is in the NIR range. data is helpful for updating existing geological maps, rapid preparation of Limitations of Remote Sensing 5. A few papers providing sensor overviews have been published, including [7, 8, 9]. Remote sensing In the following decades, some attempts were made with aerial photographs using cameras attached to balloons. Many common materials and living tissues are semi-transparent and have ‘terahertz fingerprints’, permitting them to be imaged, identified, and analyzed . The studied range sensors include single point and laser scanners, slit scanners, pattern projections, and time-of-flight systems. The first space photograph from V-2 rockets was acquired in 1946. 0000000016 00000 n All in all, when ignoring the cost issue, a wavelength of 1550 nm has a clear advantage over light at 905 nm . All Rights Reserved. The remainder of the light is absorbed and reflected by the atmosphere. NBKRIST,VIDYANAGAR. The longer the antenna is, the narrower the beam is. What is the reinforced concrete deep beam and where it used? Pan-sharpening technique was introduced by Padwick et al. to study deforestation, degradation of fertile lands, pollution in atmosphere, We share our knowledge and peer-reveiwed research papers with libraries, scientific and engineering societies, and also work with corporate R&D departments and government entities. Obtained from Wikipedia . Scribd will begin operating the SlideShare business on December 1, 2020 © 2009-2020 The Constructor. Another typical example of transmissive material is clear water. Can this type of brick bond be used for bearing walls? A radar (microwave) imaging sensor is usually an active sensor, operating in an electromagnetic spectrum range of 1 mm–1 m. The sensor transmits light to the ground, and the energy is reflected from the target to the radar antenna to produce an image at microwave wavelengths.