Yet another technique.

In this case each block represents a crime event and the way they stack 
up makes it very easy to see which areas have the most crimes.

The second example uses no lights but "glowing" (ambient) blocks so the 
lighter colored areas of the map are the more dangerous.

Comments about which of the techniques (pins, blobs, or blocks) make the 
data easiest to visualize are appreciated - as would be any ideas 
regarding other things I might try.

   Thanks in advance.

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