I don't think there is anything special about them. The thing with Google satelite images is that they are taken from a wide range of different satelites using all kinds of different cameras so there will be differences in the quality of the images across the board meaning that they cannot be compared side by side. Looking at the Area 51 images it looks like the colours in the rest of the images are slightly off as well, like somebody has bumped up the contrast too much or something. Also, looking at the shapes of the buildings it appears that this was taken from the side rather than directly above which might make the colours look odd depending on the time of day.
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