《Table 1.The 22 wavebands of MODIS applied for cloud detection》

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《Application of cloud multi-spectral radiances in revealing cloud physical structures》

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The radiances obtained by MODIS include solar or thermal radiation reflected or emitted by clouds，the surface，the atmosphere，and so on.The 22 spectral bands（in Table 1）are designed to measure different cloud physical characteristics.For example，radiances at infrared bands are closely related to the cloud-top pressure；the combination of radiances at visible and near-infrared bands is applicable in estimating cloud optical thickness and cloud effective radius.Radiances at one single waveband might be highly sensitive to a particular physical property of clouds.Other cloud properties might be detected by combinations of radiance data from two or more spectral wavebands.Radiances at particular spectral bands might show weak sensitivity to a particular cloud physical property.Thus，although radiances at different spectral bands are known to have reflected cloud physical properties，the roles that they might play in revealing such physical details have been uncertain.It has thus been necessary to investigate which spectral bands and combinations of bands from the 22available wavebands can best be used to represent various physical properties of clouds.