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steradian - [Euclidean geometry] The solid (conical) angle subtended at the center of a sphere of radius r by a bounded region on the surface of the sphere having an area r squared. There are 4π steradians in a sphere.
[Category=Geospatial ]
Source: esri, 31 August 2012 07:29:05, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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