The altitude (elevation from the horizon), azimuth and distance of a point B from A are the coordinates of the Topocentric Coordinate System as typically used in astronomy to aim your telescope to a heavenly body. It can be also of use to know where an airplane is in the sky with respect to an observer on Earth.

altitude_azimuth_distance(a, b)

Arguments

a the observer position: a vector of longitude, latitude (in decimal degrees) and altitude (in meters) in WGS84 the observed position: a vector of longitude, latitude (in decimal degrees) and altitude (in meters) in WGS84

Value

the coordinates in North-East-Up of the observed, B, with respect to the observer A. A vector of altitude (elevation from the horizon) in decimal degrees, azimuth) in decimal degrees and distance in meters.

Other utilities: along_track_distance(), cross_track_distance(), cross_track_intersection()
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