[R] Maps and plotting

[Shawn Way]

 At our facility we have multiple sample points that are sampled on any
given day.  What I would like to do is create a map of the facility with
the sample points (and point labels) and when we have out of
specification results, place a transparent dot over the area on the map.
As the number of OOS results builds up, I envision the dot getting
darker.

Are there any packages out there that can aid me in doing this?

Thanks,
Shawn Way, PE
Engineering Manager
 

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"Policies are many, Principles are few, Policies will change, Principles
never do." 
-John C. Maxwell