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Re:Introducing Google Earth 6—the next generation of realism by martian on Monday November 29, 2010 @04:19PM (#1951817)
Just a hunch: I suspect they're not auto-detecting the trees, but rather relying on (amazing) tools like

http://www.urbanforestmap.org/

Re:Introducing Google Earth 6—the next generation of realism by Groxx on Monday November 29, 2010 @07:04PM (#1952423)
That map only San Francisco? I'm going with the LIDAR theory.