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These three modules are the Selective Iterated BoundarY Locator (SIBYL), the Scene Classification Algorithm (SCA), and the Hybrid Extinction Retrieval Algorithms (HERA), respectively.
While the layer detection algorithms bear similarities to the LITE feature finder, the addition of a scene classification algorithm to CALIPSO data processing is a major advancement over LITE.
The Scene Classification Algorithm first identifies layers as either cloud or aerosol, based primarily on scattering strength and the spectral dependence of the lidar backscattering.
If a layer is classified as cloud, the SCA will then determine if it is an ice cloud or water cloud using the layer-average depolarization ratio, along with ancillary information such as layer height and temperature [ , 2001].
The SCA also uses a combination of observed parameters and information to select an appropriate extinction-to-backscatter ratio, or lidar ratio (Sa for aerosol layers, Sc for clouds), and multiple scattering function, (z), required for retrieving extinction and optical depth.
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