In this study, an algorithm was developed to retrieve simultaneously cloud optical thickness, effective particle radius, top height, and geometrical thickness of cloud layer from the spectral information of visible, near infrared, thermal infrared, and oxygen A band channels. This algorithm was applied to the First ISCCP Regional Experiment (FIRE, conducted in 1987) airborne data which included the relevant four channels and targeted at the low-level marine clouds off the coast of California in summer. The retrieved results seems to be comparable to the in situ microphysical observation. But, for the cloud geometrical parameters (top and bottom heights), compared to lidar observation, variance of the retrieved cloud bottom height is rather large for multilayered cloud system in particular.
The other data sets, recently observed in airborne and spaceborne measurement, will further be analyzed, so as to confirm the algorithm's utility and check the limitation on a regional and global scale, respectively. The algorithm will be applied to the Global Imager (GLI) spaceborne data set to make global cloud products. The GLI will be onboard with Advanced Earth Observing Satellite-II (ADEOS-II) satellite which will be launched in 2002 by National Space Development Agency of Japan (NASDA).