I suspect the "white line" is in fact the edge of the image as received from the satellite. The costal outlines and poltical borders are supplied by another ground based image on which the satellite image is superimposed. Notice nothing other than the background map image is displayed on the other side of the line.
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"Neither can his Mind be thought to be in Tune,whose words do jarre; nor his reason In frame, whose sentence is preposterous..."
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