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the white line is the edge of the field of view for that camera. the slope of the line shows the track of the satellite. Anyways, you can see the same thing on the evening news weather report, look at the rain data for the whole country. you can faintly see where theres a line just off the east coast and through the midwest. these are where they overlap two satellite images and can't perfectly match gain. why is that edge so bright? bad pixels on the ccd? shutter effect? Maybe they use a one piece shutter and that side is exposed the longest?
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