Remote sensing data and its applications are particularly valuable for Africa because the African Continent is vast and many area/environment are difficult to access.
Remote that means something which is not exactly in contact or physical contact, Sensing means getting information, data something like temperature, pressure, photograph, etc.
Remote sensing is the process of acquiring information, detecting, analyzing, monitoring the physical characteristics of an area by recording it is reflected and emitted radiation energy without having any physical contact with the object under study. This is done by capturing the reflected radiation/energy.
Some specific uses of remotely sensed images of the Earth include: Large forest fires can be mapped from space, allowing rangers to see a much larger area than from the ground. Tracking clouds to help predict the weather or watching erupting volcanoes, and help watching for dust storms.
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