Line of Sight

line of sight - 

(1) [3D analysis] A line drawn between two points, an origin and a target, that is compared against a surface to show whether the target is visible from the origin and, if it is not visible, where the view is obstructed.

(2) [visualization] In a perspective view, the point and direction from which a viewer looks into an image.

[Category=Geospatial ]

Source: esri, 30 May 2012 11:24:07, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation