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Unlike aerial photo which observe similar to human eyes.
Remote sensing can go much beyond & react to much wider range of radiations reflected/emitted, absorbed and transmitted by all object surfaces at a temperature above 0 Kelvin (-273°C).
The term remote sensing was first used in the early 1960s. Later, it was defined as the total processes used to acquire and measure the information of some property of objects and phenomena by a recording device (sensor) that is not in physical contact with the objects and phenomena in study
Absorptance : The ratio of the radiant energy absorbed by a substance to the energy it receives.
Band : The specific wavelength interval in the electromagnetic spectrum.
Digital image : An array of digital numbers (DN) arranged in rows and columns, having the property of an intensity value and their locations.
Digital Number : An intensity value of a pixel in a digital image.
Digital Image Processing : The numerical manipulation of DN values for the purpose of extracting information about the phenomena of the surface they represent.
Electromagnetic Radiation (EMR) : The Energy propagated through a space or a medium at a speed of light.
Electromagnetic Spectrum : The continuum of EMR that ranges from short wave high frequency cosmic radiations to long wavelength low frequency radio waves.
False Colour Composite (FCC) : An artificially generated colour image in which blue, green and red colours are assigned to the wavelength regions to which they do not belong in nature. For example, in standard a False Colour Composite blue is assigned to green radiations (0.5 to 0.6 μm), green is assigned to red radiations (0.6 to 0.7 μm and red is assigned to Near Infrared radiation (0.7 to 0.8 μm).
Gray scale : A medium to calibrate the variations in the brightness of an image that ranges from black to white with intermediate grey values.
Image : The permanent record of a scene comprising of natural and man-made features and activities, produced by photographic and non–photographic means.
Scene : The ground area covered by an image or a photograph.
Sensor : Any imaging or non–imaging device that receives EMR and converts it into a signal that can be recorded and displayed as photographic or digital image.
Reflectance : The ratio of the radiant energy reflected by a substance to the energy it receives.
Spectral Band : The range of the wavelengths in the continuous spectrum such as the green band ranges from 0.5 to .6 μ and the range of NIR band 0.7 to 1.1 μ. #examrace #upsc #ugcnet
