bearing: Bearing between geographical locations

In argosfilter: Argos Locations Filter

Bearing between geographical locations

Description

Function bearing calculates the bearing, in degrees, between two geographical locations. Function bearingTrack calculates the bearing between a sequence of locations.

Usage

bearing(lat1, lat2, lon1, lon2)
bearingTrack(lat, lon)

Arguments

lat1	latitude of the first location, in decimal degrees
lat2	latitude of the second location, in decimal degrees
lon1	longitude of the first location, in decimal degrees
lon2	longitude of the second location, in decimal degrees
lat	vector of latitudes, in decimal degrees
lon	vector of longitudes, in decimal degrees

Details

Bearings are calculated using spherical trigonometry. Formulas are given in Zwillinger (2003).

Value

bearing returns the bearing, in degrees, between the first location and the second location. 0 is North. bearingTrack returns a vector of bearings between the sequence of locations.

Author(s)

Carla Freitas

References

Zwillinger D. (2003) Standard Mathematical Tables and Formulae, 31st edition. Chapman & Hall/CRC, Boca Raton, FL.

See Also

distance

Examples

# Bearing between two geographical locations:
lat1<-rnorm(1,80)
lat2<-rnorm(1,80)
lon1<-rnorm(1,20)
lon2<-rnorm(1,20)
bearing(lat1,lat2,lon1,lon2)

# Bearing between a sequence of 10 geographical locations:
lat<-rnorm(10,80)
lon<-rnorm(10,20)
bearingTrack(lat,lon)

argosfilter documentation built on Sept. 13, 2022, 5:05 p.m.