ncf (version 1.1-2)

gcdist: Greater circle distance

Description

Greater circle distance function to calculate spatial distance from lat-long data. Called by various functions.

Usage

gcdist(x1, y1, x2, y2)

Arguments

x1

longitude 1.

x2

longitude 2.

y1

latitude 1.

y2

latitude 2.

Value

• The distance in km is returned

Details

Function for great circle distance -- due to T. Keitt. See http://www.census.gov/cgi-bin/geo/gisfaq?Q5.1.