Remote Sensing

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Remote sensing is the act of acquiring information about a phenomenon that is not in intimate contact with the information collecting device. In geography, it helps in studying landforms, vegetation, …

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Human eyes detect light between 4,000 and 7,000 angstroms, ears detect sound between 16 and 20,000 cycles per second, and skin senses changes in temperature. All three receive information from a dista…

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Visible light extends from about 0.4 to 0.7 microns. It includes the colours violet, blue, green, yellow, orange, and red. This small part of the electromagnetic spectrum is the range seen by the huma…

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Hertz is the unit of frequency. One hertz equals one cycle per second. Frequency tells how many waves pass a fixed point in one second.

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Wavelength and frequency are inversely related. Long waves have low frequency, while short waves have high frequency. Both describe wave motion, and electromagnetic waves travel at about 3,00,000 km p…

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One angstrom equals 0.00000001 centimetre, or 10^-8 cm. One micron equals 0.0001 cm, or 10^-4 cm, which is equal to ten thousand angstroms. One micron is also one millionth of a metre.

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The four basic classes are radiometer, audiometer, magnetometer, and gravimeter. Radiometer measures energy in parts of the electromagnetic spectrum, audiometer measures sound wave intensity, magnetom…

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A radiometer is the most important tool of remote sensing for geographical purposes because it measures the energy level of portions of the electromagnetic spectrum. This helps in studying reflected o…