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Plotting on an image

• To: mathgroup at smc.vnet.net
• Subject: [mg97756] Plotting on an image
• From: Daniel <janzon at gmail.com>
• Date: Fri, 20 Mar 2009 02:42:47 -0500 (EST)

I would like to plot values on an image. Let's say I use the following
image of the world which imports as a Graphics object:

world = CountryData["World", "Shape"]

How do I specify the coordinate system for this graphics object?
Later, when I combine the world picture with a plot using Show, I want
the plot points to end up at the right place.