[R] Drawing (lon,lat) coordinates onto the image of a world

[Sarah Goslee]

Hi Steve,

On Mon, Jun 25, 2012 at 9:47 PM, Steven Winter <stevenwinter88 at yahoo.com> wrote:
> Given a set of latitude and longitude coordinates pairs (stored in variables "latitudevals" and "longitudevals"), I would like to plot them onto the image of a equirectangular world map. I would like to plot each coordinate pair with a red circle, if possible. Does anyone have any suggestions as to how I go about doing this, whether using R or using another program like Google maps?

This might help:

library(maps)
map("world")
lon <- c(-75, -70, 10)
lat <- c(42, -45, 50)
points(lon, lat, col="red", pch=19)

Sarah


> Thank you,
> Steve
>        [[alternative HTML version deleted]]
>


-- 
Sarah Goslee
http://www.functionaldiversity.org