along_track_distance {nvctr}

Compute the along-track distance from a great circle arc

Description

Compute the along-track distances of a body, 'b' (for example a ground level projection position of an aircraft), from two geographical coordinates, ‘a1' and 'a2' (for example an airport’s runway thresholds), of a great circle arc.

Usage

along_track_distance(b, a1, a2)

Arguments

b

the geographical coordinates (WGS84) of a body: a vector of longitude, latitude (in decimal degrees) and eventually altitude (in meters)

a1

the geographical coordinates (WGS84) of one end of a great circle arc: a vector of longitude, latitude (in decimal degrees) and eventually altitude (in meters)

a2

the geographical coordinates (WGS84) of the other end of a great circle arc: a vector of longitude, latitude (in decimal degrees) and eventually altitude (in meters)

Value

the surface along-track distances from ‘b'’s cross-track intersection to 'a1' - 'a2'

See Also

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

Examples

## Not run: 
b <- c(8.086135, 49.973942, 6401)
# EDDF: 07R (longitude, latitude, altitude)
a1 <- c(8.53417, 50.0275, 328)
# EDDF: 25L
a2 <- c(8.58653, 50.0401, 362)
along_track_distance(b, a1, a2)

## End(Not run)