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US Transportation Web at Nighttime

Tue, 12/10/2013 - 3:34pm

Click to Enlarge -- Image Courtesy of NASA Earth Observatory/Jesse Allen and Robert SimmonThe Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP (National Polar-orbiting Partnership) satellite acquired two nighttime images early on October 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. 

The United States has more roads — 4.1 million miles (6.6 million kilometers) — than any other nation in the world, and roughly 40 percent more than second-ranked India. About 47,000 of those U.S. miles are part of the Interstate Highway System, established by President Dwight Eisenhower in the 1950s. The country also has 127,000 miles (204,000 kilometers) of railroad tracks and about 25,000 miles (40,000 kilometers) of navigable rivers and canals (not including the Great Lakes).

 

 

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