[R] Draw a circle with a given radius in an existing map

[Uwe Ligges]

Xiaomei Ma wrote:
> I have drawn a map in which the X and Y axes are latitude and 
> longitude. Now I need to draw one circle on the map - the center is a 
> point with specific latitude and longitude, but the challenge is that 
> the radius is in miles. Is there a way to do this? I'd very much 
> appreciate your response.


See ?symbols

Uwe Ligges


> XM
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