The Null Device

Flight of the phoenix

What do you get when a plane flies immediately beneath a satellite camera while it's taking a picture? This:
Which suggests that the cameras in question take four separate monochromatic exposures (with blue, green and red filters, and unfiltered for intensity), and composite them together to get a higher-resolution image of the earth (or at least the parts of it which aren't moving at speed at high altitudes).

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