automatic picture transmission

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The continuous transmission of images of the Earth by polar-orbiting meteorological satellites. The radiometer scan is perpendicular to the plane of the satellite's orbit, so that the image consists of a continuous swathe around the Earth. Data from two channels are normally transmitted simultaneously: visible and one infrared channel during daytime, and two infrared channels at night. See also high-resolution picture transmission; Wefax.

Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

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