Cloud fraction

Cloud fraction is the percentage of each pixel in satellite imagery or each grid box in a weather or climate model that is covered with clouds. A cloud fraction of one means the pixel is completely covered with clouds, while a cloud fraction of zero represents a totally cloud free pixel.[1] Cloud fraction is important for the modeling of downward radiation.[2] Unlike sky cover, cloud fraction is often treated as the proportion of a horizontal area covered by clouds as viewed from below.[3]

## References

1. ↑ Cloud Fraction NASA Earth Observatory, January 2005.
2. ↑ L. Chen, G. Yan, T. Wang, H. Ren, J. Calbó, J. Zhao, R. McKenzie (2012), Estimation of surface shortwave radiation components under all sky conditions: Modeling and sensitivity analysis, Remote Sensing of Environment, 123: 457–469.
3. ↑ Kassianov, Evgueni; Long, Charles N.; Ovtchinnikov, Mikhail (1 January 2005). "Cloud Sky Cover versus Cloud Fraction: Whole-Sky Simulations and Observations". Journal of Applied Meteorology 44 (1): 86–98. doi:10.1175/JAM-2184.1.

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