cross_track_intersection: Calculate cross-track intersection

In nvctr: The n-vector Approach to Geographical Position Calculations using an Ellipsoidal Model of Earth

Description

Calculate the cross-track intersection between the position of a body (i.e. an aircraft) and a great circle arc as defined by two points (i.e. the runway's thresholds).

Usage

cross_track_intersection(b, a1, a2)

Arguments

b	coordinates of the body, b: a vector of longitude, latitude (in decimal degrees) and altitude (in meters) in WGS84
a1	first coordinate of a great circle arc: a vector of longitude, latitude (in decimal degrees) and elevation (in meters) in WGS84
a2	second coordinate of a great circle arc: a vector of longitude, latitude (in decimal degrees) and elevation (in meters) in WGS84

Details

The cross-track intersection between the position of a body, B, (i.e. an aircraft) and a great circle arc as defined by two points, A1 and A2, (i.e. the runway's thresholds) is the intersection, X, of the above arc with the great circle arc passing through the ground projection of B, G, and perpendicular to A1-A2.

Value

a WGS84 vector with longitude and latitude (decimal degrees)

See Also

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

Examples

## Not run: 
# aircraft (longitude, latitude, altitude)
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)
cross_track_intersection(b, a1, a2)

## End(Not run)

nvctr documentation built on Oct. 28, 2020, 5:07 p.m.