Coloring A Map According To Mapped Database Values?

Jul 17, 2010

Coloring a map according to mapped database values?

Question: [URL]
one can see a map of european countries colored according to state debt/deficit. Now I would have already found it useful several times if I was able to do such a thing myself, for example to visualize regional sales data.

Is there any (OpenSource) tool with which I can color a world/continental/reginal map according to colors mapped to values in a database ? Or any tool that can construct a custom map ?

Or if there is no such thing, how would one do such a thing oneselfs ? Get the outlines of countries from somewhere, make everything outside the country outlines transparent, set the coordinates and z-indeces to stack several images over one another, and then replace the base color with the selected color in each image, then merge the result to a single picture ?

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