The retrieval of aerosol characteristics over land from satellite data has been a challenge up to now. Currently, several well known techniques for retrieving aerosol optical thickness (AOT) have been developed for satellite instruments including MODIS (Kaufman et al., 1997; Remer et al., 2005), MERIS (Santer et al., 1999, 2000), POLDER (Deuze et al, 2001), and MISR (Martonchik et al., 2002). While each technique has its own merits, the accuracy of AOT retrieval still needs further clarification and improvement. From this point of view the inter-comparison and verification of these techniques undertaken recently (Kokhanovsky et al., 2007) is of a great importance.