Cloud property datasets retrieved from AVHRR, MODIS, AATSR and MERIS in the framework of the Cloud_cci project by Stengel, M, Stapelberg, S, Sus, O, Schlundt, C, Poulsen, C, Thomas, G, Christensen, M, Henken, C, Preusker, R, Fischer, J, Devasthale, A, Willen, U, Karlsson, K, McGarragh, G, Proud, S, Povey, A, Grainger, R, Meirink, J, Feofilov, A, Bennartz, R, Bojanowski, J, Hollmann, R