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English: This image of the earth at night is a composite assembled from data acquired by the Suomi National Polar-orbiting Partnership (Suomi NPP) satellite over nine days in April 2012 and thirteen days in October 2012. It took 312 orbits and 2.5 terabytes of data to get a clear shot of every parcel of the earth’s land surface and islands.
The night time view of the earth was made possible by the "day-night band" of the Visible Infrared Imaging Radiometer Suite. VIIRS detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe dim signals such as gas flares, auroras, wildfires, city lights, and reflected moonlight. In this case, auroras, fires, and other stray light have been removed to emphasize the city lights.Named for satellite meteorology pioneer Verner Suomi, NPP flies over any given point on the earth’s surface twice each day at roughly 1:30 am and 1:30 pm. The spacecraft flies 824 kilometres (512 miles) above the surface in a polar orbit, circling the planet about 14 times a day. Suomi NPP sends its data once per orbit to a ground station in Svalbard, Norway, and continuously to local direct broadcast users distributed around the world. The mission is managed by NASA with operational support from NOAA and its Joint Polar Satellite System, which manages the satellite's ground system.
|Date||(photographed in April and October 2012)|
|Source||NASA Earth Observatory|
|Author||NASA Earth Observatory|
|Comment||Source provides even larger image sizes up to 54,000 × 27,000 pixels, also tiled|
|Orientation of image||1|
|Image resolution in width direction||72|
|Image resolution in height direction||72|
|Unit of X and Y resolution||2|
|Color space information||65535|
|Exif image width||13500|
|Exif image length||6750|
|Software used||Adobe Photoshop CS6 (Windows)|
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