What sort of CCD is used – is it for video motion or still picture?
The CCD imager used is a still frame camera, and not a low cost NTSC / PAL type motion video camera. The maximum practical sampling (frame) rate is two frames a minute, about 1/1000th as fast as the 30 frames/second of a video camera. The CCD used offers much better low light performance and better spatial sampling compared to a consumer-type video camera. A slower frame rate permits longer CCD integration times and also allows higher color stability, critical to getting good cloud detection performance. As clouds do not move very fast, using video would be a waste of bandwidth.
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