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Google has issued a fancy [link url=https://www.google.com/get/sunroof#p=0 target=_blank]map showing all roofs of houses[/link] in all US States. Why? So that everybody can have a look how strong solar radiation is on one’s own roof and if the investment in a solar array is worthwhile. Local weather data and surrounding objects giving shade like trees or high-rise buildings were considered in the calculations.