Choose Index below for a list of all words and phrases defined in this glossary.
nadir -
(1) [aerial photography] In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens.
(2) [astronomy] In astronomy, the point on the celestial sphere directly beneath an observer. Both the nadir and zenith lie on the observer's meridian; the nadir lies 180 degrees from the zenith and is therefore unobservable.
[Category=Geospatial ]
Source: esri, 16 June 2012 09:09:50, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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