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you have to keep in mind the time of year the image is done. It often isn't the "same" when you actually get there.
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I love Google Earth. Be sure to check out 3D buildings in most urban areas.
Some of the photos are very recent, and they are constantly updating.
To give you an idea, look at Hong Kong Disneyland. Currently on GE it is
a big construction site, but the park actually opened last September.
When I look at my house on GE, I can clearly see a scar down the middle of
the yard where the city buried new sewerage lines, but that work was done in
the winter of '02, and the lawn has long since erased it.
I understand you can subscribe for extra $$$ and have more recent and/or
real time images, but for me the free version is outstanding no matter if some images
are a couple years old!
P