I downloaded earth.google and it is indeed a better programme. The thing which puzzles me greatly is why half of a city is in very sharp focus and the other half very blurry. This happens with Auckland, where the North Shore is amazingly clear but in the city and southern suburbs it is hardly possible to discern individual streets, never mind houses. I looked at other cities around the globe and found the same thing. It all seems very arbitrary as quite often the city centres, presumably of greater interest, are blurry while odd suburbs are very sharp.
Does anybody know why this is so ?