Viewpoint. Should not be specified under normal circumstances since it is
set by a previous call to globeearth (details documented
there).
top
Top of plot (commonly the North Pole). Should not be specified under normal
circumstances since it is set by a previous call to globeearth
(details documented there).
…
Additional arguments passed to segments to
control the plotting of lines.
Value
Lines of latitude/longitude are plotted on the existing image.