[R] plotting points over a map using R

李德磊 deleili at hotmail.com
Fri Jan 31 10:58:24 CET 2014

Hello everyone,
I have no idea how to plotting points over a map using R, in which the colors of the points stand for the points' value. I'd like to get a map as shown in attachment picture which was plotted using matlab. Does anyone know how to do it using R?  Thank you very much for your help in advance.  
Kind regards,Dli 		 	   		  
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