curvy: curvy - internal function to compute spherical coordinates of...

In R2G2: Converting R CRAN outputs into Google Earth.

Description

An arc is defined by startDD and stopDD, the coordinates of its limit points (decimal degrees). New points are computed according to f, i.e. the fraction at which the desired point is located along the arc (f varies between 0 -> startDD to 1 -> stopDD)

Usage

curvy(f, startDD, stopDD)

Arguments

f	Fraction of arc at which the desired point is located. f varies between 0 and 1, to generate points located between startDD and stopDD)
startDD	Geographical location of starting point of the arc (longitutde, latitude in decimal degrees).
stopDD	Geographical location of stoping point of the arc (longitutde, latitude in decimal degrees).

Value

The geographical coordinates of the desired point (longitude, latitude in decimal degrees).

Author(s)

Nils Arrigo, [e-mail] 2012 EEB, the University of Arizona, Tucson

References

The original function was actually proposed by Rod Page on http://iphylo.blogspot.com/

Examples

startDD = c(1, 5)
stopDD = c(5, 1)
curvy(0.5, startDD, stopDD)

R2G2 documentation built on May 29, 2017, 1:41 p.m.