USA by Night
silk + modal
made in italy
This image of the United States of America at night is a composite assembled from data acquired by the Suomi NPP satellite in April and October 2012. The image was made possible by the new satellite’s “day-night band” of the Visible Infrared Imaging Radiometer Suite (VIIRS), which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe dim signals such as city lights, gas flares, auroras, wildfires, and reflected moonlight.
“Nighttime light is the most interesting data that I’ve had a chance to work with,” says Chris Elvidge, who leads the Earth Observation Group at NOAA’s National Geophysical Data Center. “I’m always amazed at what city light images show us about human activity.” His research group has been approached by scientists seeking to model the distribution of carbon dioxide emissions from fossil fuels and to monitor the activity of commercial fishing fleets. Biologists have examined how urban growth has fragmented animal habitat. Elvidge even learned once of a study of dictatorships in various parts of the world and how nighttime lights had a tendency to expand in the dictator’s hometown or province.
"‘The revolution has been favorable to science in general, particularly to that of the geography of our own country,’ wrote the Reverend Jedidiah Morse. In 1784, when Morse published his first geography textbook, he dedicated it ‘To the Young Masters and Misses Throughout the United States,’ signaling its appropriateness for females. Highly popular among boys and girls alike, Morse’s Geography Made Easy ran through numerous editions at least until 1820, when the twenty-third edition appeared. Geography was the first science to appear widely in girls’ schoolbooks after the American Revolution. – Kim Tolley