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Xiaofeng Wang - Xiaofeng Wang Problem#4 Interpretation of...

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Xiaofeng Wang Problem#4: Interpretation of satellite image The two figures above (drawn by myself when I was in Beijing) are the cloud parameter product from MODIS. The bands involved in the retrievals of cloud optical thickness and cloud droplets effective radius includes 0.645µm (used for land surface) / 0.858µm (ocean surface)/ 1.24µm (ice & snow surface), 1.64µm, 2.13µm, 3.75µm. Cloud optical thickness is defined as the vertical integration of extinction over the whole cloud physical thickness. And cloud droplet effective radius is the ratio of the third moment of size distribution to the second moment of size distribution. In order to get the retrievals, first we need to know the reflectance of a specific band in a finite interval, expressed as: Where, cloud optical depth; effective radius; µ cosine of absolute value of zenith angle; cosine of solar radiation zenith angle; the relative azimuth angle between the direction of reflected radiation and the incident solar direction; f(λ) band’s spectral response;
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