[R-sig-Geo] Plot Great Circle path on e.g. wrld_simpl?

[John Baumgartner]

Take a look at
http://flowingdata.com/2011/05/11/how-to-map-connections-with-great-circles/

At its simplest, I think you want to add:

library(geosphere)
path <- gcIntermediate(c(-120, 45), c(0, 55), n=50, addStartEnd=TRUE)
lines(path)

Cheers,
John


On Fri, Jun 26, 2015 at 2:16 PM, Nick Matzke <nickmatzke.ncse at gmail.com>
wrote:

> Hi,
>
> Is there an easy way to plot a Great Circle path between two points on a
> world map, e.g. wrld_simpl?
>
> E.g., something like this, but Great Circle instead of the flat-map
> straight path:
>
> ===================================
> library(maptools) # for e.g. wrld_simpl
>
> data(wrld_simpl)
> plot(wrld_simpl)
>
> # This plots the flat-map straight line, but
> # I would like a plot of the Great Circle path
> segments(x0=-120, y0=45, x1=0, y1=55, lwd=2)
> ===================================
>
>
> I googled around some but didn't find anything super-obvious.
>
> Cheers!
> Nick
>
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