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Images at the interactive map services from Google, Microsoft, Yahoo and others have been compiled with the help of satellite and aerial digital photography. Vexcel, which has been acquired by Microsoft earlier this year, is one of the companies to supply digital cameras specifically for this purpose. The Vexcel Ultracam-x digital aerial camera delivers 216 megapixel images, spanning 14,430 pixels across track and 9,420 pixels along track, and stored on devices called DX units of 1.7 Terabytes that can hold 4000 images...
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