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Huh, I haven't looked at this in awhile. In my code I have an option for "relative to ground" vs. "absolute" but it isn't in the menu. I'll try to see, when I get a chance, if there was a reason for that or if it is just an oversight.
Oh, never mind. It's in there at the bottom. I think the reason I ended up going with absolute is that relative produced weird effects a lot of the time. But I can take another look at it.
My recollection is it has to do with the size of the polygons — if their points are all relative to ground then the different layers overlap a lot. There is probably some cleverer approach to it than what I've done, if I dive into KML spec.
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