Validation summary for Cloud cover fraction by KNMI (last update: 6-5-2008)

The FRESCO+ sc-v5 effective cloud fraction is the cloud fraction of a Lambertian cloud with albedo 0.8 yielding the same TOA radiance as the real cloud in the scene. Generally the effective cloud fraction is smaller than the geometric cloud fraction. The FRESCO+ sc-v5 effective cloud fraction is consistent with that from other algorithms, like HICRU (from IUP Heidelberg) and OCRA (from DLR, used in level 2 v3.01), within 0.05 for all surfaces, excluding snow and ice (Wang et al., 2010).


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