clear_sky_area_fraction
https://w3id.org/hacid/data/cs/variables/cf/clear_sky_area_fraction <https://w3id.org/hacid/onto/data/Variable>
"Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. The clear_sky area fraction is for the whole atmosphere column, as seen from the surface or the top of the atmosphere. "Clear sky" means in the absence of clouds.
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clear_sky_area_fraction