The second hack for making proportional symbols in KML, is to use
regular polygons (see the first hack
here and
here). Unfortunately, KML has no build-in support for regular polygons so you have to do it the hard way: by calculating the longitude/latitude for each vertex or corner point of the polygon. Since I'm not a math genius, I was happy do find
this PHP function by TJ which I could modify for this purpose. This is the result:

By changing the bearing or angle 30 times from 0 to 360, the function returns a circle (
KMZ).

Reduce the number of iterations to 4, and you'll get a square (
KMZ). Not the easiest way to draw a square, but it works.
These files are also viewable in
Google Maps and
Microsoft Live Maps (Virtual Earth), even though the circles are not so regular any more.

2 comments:
Is it possible to see the code that generates the KML-files?
could you please post the link to the php function by TJ
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