| Definitions | noun - (meteorology) The fraction of the sky that is obscured by clouds, in eighths (one okta means that one eighth of the sky is obscured, two oktas that one quarter is obscured, and so on).
- 1960, American Meteorological Society, Meteorological and Geoastrophysical Abstracts, American Meteorological Society, Page 480
- :...64% of the low- and 50% of the high-cloud amount differences were within ± 1 , although many of these successes (71% in the low-cloud amount) were for cases of totally clear or totally cloudy skies.
- 1985, University of East Anglia, Geo Abstracts, University of East Anglia, Page 29
- :Mean cloud amount distributions are transformed to normal distributions. The accuracy of the method is indicated by the retrieval of the original distribution with a typical error of 14% in the frequency of each of cloud amount. - Author
- 2001, W.G. Rees, Physical Principles of Remote Sensing - Second Edition, Cambridge University Press, Page 100
- :For example, it has been estimated that a Landsat satellite, which revisits a particular location once every 16 days, will obtain a cloud-free scene of a particular location in Britain only once per year, and a scene with 1 of cloud (an is one eighth of the sky obscured by cloud) only twice per year.
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