Plot points, lines and arrows on an plot of the Earth created by
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A matrix or list of points to plot (
Viewpoint. Should not be specified under normal circumstances since it is
set by a previous call to
Top of plot (commonly the North Pole). Should not be specified under normal
circumstances since it is set by a previous call to
Length of arrows to be plotted (
Optional additional arguments passed to
Logical value indicating whether to actually perform the plotting, or just to return the calculated coordinates.
globeearth needs to be invoked first before any of these
functions can be used. The values of
globeearth should be identical to the values used in
these functions to get meaningful results.
globepoints plots points at the specified locations on the
globelines draws line between the specified locations in the
order that they are written, but not between the first and last points
e.g. if we list three different points A, B, C in loc, then
lines will be drawn from A to B, and from B to C, but not C to A.
globearrows plots lines at the specified locations, that extend
away from the centre of the globe and are of the specified length.
The return value is invisible.
globepoints, the return value is a
giving the plotted coordinates of the points.
globearrows, the return value is a
4-column matrix giving the plotted coordinates of the lines or arrows
as plotted by
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