| Total Power Received
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- Integrating the expression for B over all angles and over the area of the surface, we obtain the total radiant flux, or power, received by the sensor:
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| Lambertian Radiator
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- If the radiance emitted is not a function of angle, the surface is called a Lambertian radiator. The total radiant flux for such surface is given by the following expression where d Ω = sin θ d θd Φ
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| Spectral Quantities
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- In remote sensing, radiance is observed over narrow frequency, wavelength, or wavenumber bands, so spectral versions of the previous terms are defined by dividing by the bandwidth:
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- Spectral brightness plays c entral role in remote sensing problems and gives precise, quantitative description of radiation
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