nvctr (version 0.1.4)

along_track_distance: 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)
# }