Plots a grid defined by the vectors lat, lon. The grid is plotted on a graph
initialized by geoplot. lon gives the meridians plotted and lat the
parallels plotted.
Latitude and longitude of data ( or x and y coordinates),
negative for southern latitudes and western longitudes. May be supplied as
two vectors or as a dataframe lat (or x) including vectors lat$lat
and lat$lon (x$x and x$y if projection = none).
col
Color number used, default value is 1 (black).
type
"l" means line and "p" points. Default is "l".
lwd
Linewidth. Default value is the value set when the program was
called.
lty
Linetype. Default value is the value set when the program was
called.
## Not run: geogrid(latgr, longgr)
codgrd <- list(lat = seq(62, 68, by = 0.1), lon = seq(-28, -10, 0.25))
geogrid(codgrd) # a fine grid of Iceland and neighbouring seas
geoplot(new = T)
## End(Not run)