GreatDist {RSEIS}

Distance Along Great Circle Arc

Description

Distance Along Great Circle Arc in degrees, kilometers

Usage

GreatDist(LON1, LAT1, LON2, LAT2, EARTHRAD= 6371)

Arguments

LON1

Longitude, point1

LAT1

Latitude, point1

LON2

Longitude, point2

LAT2

Latitude, point2

EARTHRAD

optional earth radius, default = 6371

Value

LIST:

drad

distance in radians

ddeg

distance in degrees

dkm

distance in kilometers

Author(s)

Jonathan M. Lees <[e-mail]>

Examples

###  get distance between London, England and Santiago, Chile
london  <-  c(51.53333, -0.08333333)
santiago  <-  c(-33.46667, -70.75)

GreatDist(london[2], london[1], santiago[2], santiago[1])