icosa: arcdist – R documentation

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arcdist

Calculation of distances along arcs

This function calculates the shortest arc distance between two points.

arcdist(p1, p2, output = "distance", origin = c(0, 0, 0), radius = authRadius)

`p1`	(`numeric`) Vector, XYZ or longitude-latitude coordinates of the first point along the arc.
`p2`	(`numeric`) Vector, XYZ or longitude-latitude coordinates of the last point along the arc.
`output`	(`character`) The type of the output value. `"distance"` will give the distance in the metric that was fed to the function for the coordinates or the radius. `"deg"` will output the the distance in degrees, `"rad"` will do so in radians.
`origin`	(`numeric`) Vector, the center of the circle in XYZ coordinates (default is `c(0,0,0)`).
`radius`	(`numeric`) The radius of the circle in case the input points have polar coordinates only. Unused when XYZ coordinates are entered. Defaults to the authalic radius of Earth ca. 6371.007km.

A single numeric value.

# coordinates of two points
point1<- c(0,0)
point2<- c(180,0)
arcdist(point1,point2,"distance")

Global Triangular and Penta-Hexagonal Grids Based on Tessellated Icosahedra

v0.10.1

GPL-3

Authors

Adam T. Kocsis [aut, cre]

Initial release

2021-01-12