28 Jul '14, 7pm

The Difference between Night and Day

The Difference between Night and Day

(Repost of an article on the Exelis Vis Imagery Speaks blog.) One of the most interesting new capabilities of the NOAA/NASA/DoD Suomi-NPP satellite is the Day-Night Band. These detectors, part of the Visible Infrared Imaging Radiometer Suite (VIIRS), are sensitive enough to image Earth’s surface by starlight. The Day Night Band is both higher resolution and up to 250 times more sensitive than its ancestor, the DMSP Operational Linescan System (OLS). Applications of the Day Night Band include monitoring warm, low-level clouds , urban lights , gas flares , and wildfires. Long-term composites reveal global patterns of infrastructure development and energy use. Over shorter times scales (Suomi-NPP completes an orbit every 100 minutes or so) multiple Day Night Band scenes stitched together show a snapshot of the Earth at night, like this view of South America, including the 14 ...

Full article: http://earthobservatory.nasa.gov/blogs/elegantfigures/201...

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