Is there a way to grab a list of all the coordinates of, say, all the 
administrative districts, within the displayed map bounds?

Also, does google have polyline boundaries of cities available, or just a 
central point?

The LA Times, for instance, has a really amazing (if not depressing) homicide 
map, where at certain zoom levels, it shows only circles with the number of 
homicides per, what I assume, are neighborhoods.

see: http://projects.latimes.com/homicide/map/

I am assuming they are not plotting these points individually (ie, have a 
database they created and manually put points in for the neighborhoods), but 
using something, perhaps "locality" or "administrative districts" to define the 
coordinates, then run an sql query to get the number of homicides within those 
coordinates, and then display that number in the circle until you reach a 
certain zoom level where the individual data points are shown.

Does this seem right? I'm not looking for specific pointers on how to do this, 
just a discussion of how it might be done in theory.


Thanks

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