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The Day/Night Whole Sky Imager (WSI) is an automated imager used for assessing and documenting cloud fields and cloud field dynamics. The WSI is a ground-based electronic imaging system that monitors the upper hemisphere. It is a passive, i.e., non-emissive, system that acquires images of the sky dome through four spectral filters (neutral, red, blue, and NIR). From these sky images, we can assess the presence, distribution, shape, and radiance of clouds over the entire sky using automated cloud decision algorithms and related processing. The Day/Night WSI (EO System 6) is capable of image acquisition under daylight, moonlight, and starlight conditions.
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