NASAのインスタグラム(nasa) - 11月27日 04時39分

Traveling for #Thanksgiving? It’s a time when the nation’s transportation network is clogged with travelers. According to the American Automobile Association, an estimated 43.4 million Americans will travel 50 miles (80 kilometers) or more during Thanksgiving week, with the average round trip being 600 miles (1,000 kilometers). More than 90 percent of them will use cars or trucks, while the rest will ride planes or trains.

The imprint of the transportation web becomes easier to see at night. The Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP (National Polar-orbiting Partnership) satellite acquired two nighttime images early on Oct. 1, 2013, for this natural-light, mosaic view of the continental United States. The VIIRS instrument uses a “day-night band” of wavelengths that is sensitive to low light levels and manmade light sources. The images were collected just three days before the new moon, so reflected light from space and the atmosphere was relatively low. It was also a rare night when most of the nation was cloud-free.

Image Credit: NASA Earth Observatory image by Jesse Allen and Robert Simmon, using Suomi NPP VIIRS and DMSP OLS data provided courtesy of Chris Elvidge (NOAA National Geophysical Data Center)
Caption: Mike Carlowicz

#nasa #space #traffic #transportation #map #viirs #npp #satellite #night #infrared

[BIHAKUEN]UVシールド(UVShield)

>> 飲む日焼け止め！「UVシールド」を購入する