At what resolution does privacy begin?

Spotters poring over satellite images housed on the popular Google Earth service have spied what appears to be two topless sunbathers in the Dutch city of The Hague soaking up the rays. (via)

See also this blog entry:

If you’re not a celebrity, you don’t have to fear the paparazzi. But if you want to be alone on your rooftop or in your fence-shielded garden, you now might have to fear your neighbors who have Google Earth helping them. Google sightseeing just found this picture of a woman sunbathing topless on a rooftop. You can not tell the face (yet), but if you know which address it is, it can be easy to find out who this is. This is not just about the picture itself (you get high-resolution pics of topless women all over the net), but about the information it contains: There is a topless person on this specific rooftop - welcome peeping toms!

So, where does your privacy zone begin? When your face can be identified? Or much earlier? And how do we do enforcement of national privacy laws in cyberspace and outer space? Google Earth is using pictures from the American “Keyhole” satellites, and the pictures are stored on a server in the United States. Should they have to block these pictures to German visitors, as they do with government-critical content in Chinese? Or should Google reduce the resolution in general? How do you do sunbathing with a canvas cover?