Active remote sensing and passive remote sensing
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Active sensors have its own source of light or illumination. In particular, it actively sends a wave and measures that backscatter reflected back to it. But passive sensors measure reflected sunlight emitted from the sun. When the sun shines, passive sensors measure this energy
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PASSIVE REMOTE SENSING:Remote sensing is carried out with the help of solar energy is known as passive remote sensing.
ACTIVE REMOTE SENSING:Remote sensing made with the aid of artificial source of energy radiating from the sensor is known as active remote sensing.
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