| getgreatarc {GEOmap} | R Documentation |
Great Circle Arc
Description
Get points along great circle between two locations
Usage
getgreatarc(lat1, lon1, lat2, lon2, num)
Arguments
lat1 |
Latitude, point 1 (degrees) |
lon1 |
Longitude, point 1 (degrees) |
lat2 |
Latitude, point 2 (degrees) |
lon2 |
Longitude, point 2 (degrees) |
num |
number of points along arc |
Value
lat |
Latitude |
lon |
Longitude |
Author(s)
Jonathan M. Lees<jonathan.lees@unc.edu>
See Also
getgreatarc, distaz
Examples
PARIS = c(48.8666666666667, 2.33333333333333)
RIODEJANEIRO =c( -22.9, -43.2333333333333)
g = getgreatarc(PARIS[1],PARIS[2], RIODEJANEIRO[1], RIODEJANEIRO[2],
100)
library(geomapdata)
data(worldmap)
plotGEOmap(worldmap, add=FALSE, shiftlon=180)
lines(g$lon+180, g$lat)
[Package GEOmap version 2.5-5 Index]