bearing: Calculate the bearing given two points

In mpio-be/windR: Analysis of tracking data in relation to wind

Description

This function calculates the bearing (direction) for something (e.g. an animal) moving from point 1 to point 2.

Usage

bearing(x, y, x2, y2)

Arguments

x	Longitude of point 1
y	Latitude of point 1
x2	Longitude of point 2
y2	Latitude of point 2

Value

Bearing in radians from point 1 to point 2 (from -pi to pi)

Examples

# Example 1
bearing(x = 0, y = 0, x2 = 2, y2 = 2)

# Example 2
library(data.table)

d = data.table(x  = rep(0, 21),
               y  = rep(0, 21),
               x2 = seq(-10, 10, 1),
               y2 = rep(2, 21) )

               d[, bearing := bearing(x, y, x2, y2), by = 1:nrow(d)]

               plot(bearing ~ x2, d, type = 'l')

mpio-be/windR documentation built on Feb. 2, 2020, 10:04 a.m.