Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Angle of observation-en#Sense
Incidence d'observation-fr#Sense
Betraktningsvinkel-sv#Sense
Invalshoek-nl#Sense
Angle of sight-en#Sense
Lysindfaldsvinkel-da#Sense
Angolo di osservazione-it#Sense
Synsvinkel-da#Sense
Blickwinkel-de#Sense