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The basic unit of wavelength, is measured in meters (m). These divisions are not absolute and definite as overlapping may occur. This spectrum is an overview of the continuum of electromagnetic energy from extremely short wavelengths (cosmic gamma rays) to extremely long wavelengths (radio and television waves).
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These are visible light, radio waves, microwaves, heat, UV rays, X-rays and gamma rays. It is described as an electromagnetic spectrum, on which, many forms exist that describe energy in a specific region of the spectrum (Fig. Thus, today remote sensing is largely utilized in environmental management, which frequently requires rapid, accurate and up-to-date data collection.Īmong these, the energy source or electromagnetic energy, is very important, as it serves as the crucial medium for transmitting information from the target to the sensor. Unlike in the past, when remote sensing was restricted to only the visual part of the electromagnetic spectrum i.e., what could be seen with naked eye, today through the use of special filters, photographic films and other types of sensors, the parts of the spectrum which cannot be seen with the naked human eye can also be utilized. Today, remote sensing is carried out using airborne and satellite technology, not only utilizing film photography, but also digital camera, scanner and video, as well as radar and thermal sensors (Fig. In the 1960s, with the emergence of the space program, cosmonauts and astronauts started taking photographs out of the window of their spacecraft in which they were orbiting the earth. These rockets, however never attained orbit, but took pictures of the earth’s surface as the vehicle ascended.
#Types of imagery sensors movie
After World War II, in 1946, V-2 rockets acquired from Germany, containing automated still or movie camera, were launched to high altitudes from White Sands, New Mexico. It actually began as a dual approach of imaging surfaces, from spacecraft, using several types of sensors. The history of Satellite remote sensing can be traced back to the early days of the space age of both Russian and American programs. Thus, aerial photography remained the single standard tool for depicting the surface from a vertical or oblique perspective till the early 1960s. The most novel platform at the end of the last century is perhaps the famed pigeon fleet that operated as a novelty in Europe.īy the first World War, cameras were mounted on airplanes, which provided aerial views of fairly large surface areas and was used as a method of data and information acquisition, that proved invaluable in military reconnaissance. It was realized that the airborne perspective gave a completely different view than to what was available from the ground.
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The idea and practice of remote sensing first developed in the 1840s, when it was realized that a different and perhaps more revealing view of a particular landscape could be obtained by taking a photograph from a vantage point, such as an incline or building, and efforts were made to look down at the Earth’s surface by taking pictures with the aid of cameras secured to tethered balloons, for purposes of topographic mapping. Initially cameras were used to take photographs on the ground, which provided (and still does) a fascinating and exciting way to capture moments in time and keep a record of something that happened, which looked more realistic than a drawing or painting, and which could be captured much quicker than by drawing or painting. The advantage of this is that it produces a much higher spatial resolution and can often produces near infrared depending on the specific sensitivity of the sensor.The technology of modern remote sensing has a very long history, dating back to the end of the 19th century with the invention of the camera. Panchromatic imagery has a grayscale appearance due to the single band used to capture data and merge a range of individual visible light spectrums and wavelengths. Generally speaking, more spectral bands means more data and the potential for a greater variety of insights and use cases. In reality, individual bands can provide more insights that can be seen by the naked eye and are valued differently according to the specific use case. Multispectral images consist of reflected energy from several spectral bands and can produce images that look like regular colour photography. Currently the Arlula API provides direct access to Multispectral imagery of different resolutions, but other sensor types can be accessed by contacting us directly. Arlula provides access to a range of satellite imagery sensor types offered by our global network of suppliers.