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One of the most visually striking differences between VIIRS and MODIS is that VIIRS has a wider swath which provides full coverage of the globe on a daily basis. Here is a toggle between Aqua/MODIS and SNPPSuomi-NPP/VIIRS from December 7, 2015. That wider swath does have a tradeoff, though - the maximum spatial resolution of VIIRS is 375 meters per pixel while MODIS is 250 meters per pixel.
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