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Questions and Answers
A Bottom Of Atmosphere (BOA) Reflectance can be obtained without applying atmospheric correction on TOA reflectance
False
The empirical line calibration (ELC) method of atmospheric correction uses radiative transfer models
False
Atmospheric correction using radiative transfer models (RTMs) does not require parameters of atmospheric condition at the time of image acquisition
False
Increase in solar zenith angle leads to decrease in image contrast and may be due to haze
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The empirical line calibration (ELC) method of atmospheric correction is based on the principle of radiative transfer
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Converting digital numbers to absolute radiance values is a form of atmospheric correction.
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The cosine of the sun angle from zenith is used to normalize the sun angle effect in radiometric correction.
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The Landsat 7 ETM+ sensor requires a conversion of digital numbers to thermal infrared band values.
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Reflectance is a unit of measurement that provides the ratio of radiation reflected to the incident solar radiation on a given surface, and is usually expressed in units of watts per square meter.
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The solar zenith angle affects the radiance at the sensor's aperture and can be corrected for by using the mean solar spectral irradiance.
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Landsat-7 ETM+ does not require DN-to-Radiance conversion for accurate atmospheric correction.
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The Gain & Bias method of DN-to-Radiance conversion uses the LMin and LMax spectral radiance scaling factors.
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A gain change anomaly on Landsat-7 occurs randomly throughout the scene.
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Radiometric correction for Landsat 7 is not spectral specific.
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LMAXs are not required for accurate conversion to radiance units for Landsat 7.
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Dark object subtraction method is used for radiometric correction
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The solar zenith angle is the angle between the solar radiation and the normal to the Earth's surface
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Radiation transfer models are used for thermal infrared band conversion
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The unitless planetary reflectance is a measure of the amount of radiation that is reflected by the Earth's surface
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The reflected radiance is proportional to the incident radiation over pi, assuming a Lambertian surface
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