Google has also developed several desktop applications, including Google Desktop, Picasa, SketchUp and Google Earth, an interactive mapping program powered by satellite and aerial imagery that covers the vast majority of the planet. Many major cities have such detailed images that one can zoom in close enough to see vehicles and pedestrians clearly. Consequently, there have been some concerns about national security implications; contention is that the software can be used to pinpoint with near-precision accuracy the physical location of critical infrastructure, commercial and residential buildings, bases, government agencies, and so on. However, the satellite images are not necessarily frequently updated, and all of them are available at no charge through other products and even government sources; the software simply makes accessing the information easier. A number of Indian state governments have raised concerns about the security risks posed by geographic details provided by Google Earth's satellite imaging.
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