Paul,
According to Google Earth help files, it's okay to use the image as long as you leave the copyright and google logo:
We're flattered to hear that you're further incorporating Google Earth into your online world. You can personally use an image from the application (for example on your website, on a blog or in a word document) as long as you preserve the copyrights and attributions including the Google logo attribution. However, you cannot sell these to others, provide them as part of a service, or use them in a commercial product such as a book or TV show without first getting a rights clearance from Google.
Mickie
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