The Outside Blog

Nature

Black Marble: Stunning New Satellite Photos and Video of the Earth at Night

A cloud-free view from space as acquired by the Suomi National Polar-orbiting Partnership Satellite (Suomi NPP). Over nine days in April and thirteen days in October 2012, it took 312 satellite orbits and 2.5 terabytes of data to get a clear shot of every parcel of land surface.

For roughly a year, NASA has been using a satellite with a technology sensitive enough to detect and capture a picture of the light coming from a single ship at sea or a lone light on the highway. The Suomi National Polar-Orbiting Partnership Satellite employs a day-night band sensor that can analyze and adjust the amount of light in individual pixels and then put them together to create one sharp, stunning image of the earth at night. "Unlike a camera that captures a picture in one exposure, the day-night band produces an image by repeatedly scanning a scene and resolving it as millions of individual pixels," NASA said in a press release. "Then, the day-night band reviews the amount of light in each pixel. If it is very bright, a low-gain mode prevents the pixel from oversaturating. If the pixel is very dark, the signal is amplified."

711010main_dnb_united_states_673The United States at Night. Photo: NASA Earth Observatory/NOAA NGDC

It's not just that the NPP sensor is sensitive enough to detect artificial lights. It can also capture the light created by auroras or moonlight reflected in the earth's atmosphere, gas flares, and forest fires. Experts have already employed the satellite's images for a number of practical reasons. They used them to study Hurricane Sandy's moonlit-illuminated landfall in New Jersey on October 29, the power outages that resulted along the coasts of New York and New Jersey after the storm, the movement of forest fires at night in Siberia, and NOAA's Weather Service used the images to detect fog rolling into San Francisco Bay on November 26—which led to flight delays and cancellations.

711115main_nile_vir_2012287_673Nile River Delta. Photo: NASA Earth Observatory/NOAA NGDC

Scientists have been viewing and studying images of the earth at night from space for roughly four decades, but the new technology allows them to capture images with a six-times better spatial resolution and 250-times better light resolution than anything used before. They also have easier and faster access to images of the earth at night because the satellite is part of a civilian science satellite—they can see results in minutes or hours.

Russia_vir_2012216_dnbForest fires in Siberia. Photo: NASA Earth Obsevatory/NOAA NGDC

"The night is nowhere near as dark as most of us think. In fact, the earth is never really dark," says Steven Miller, an atmospheric scientist at Colorado State University. "And we don’t have to be in the dark about what is happening at night anymore either."

—Joe Spring
@joespring
facebook.com/joespring.1



Subscribe
to Outside
Save Over
70%

Magazine Cover

iPad Outside+ App Access Now Included!

Categories

GUIDES

Find the Best

Previous Posts

2014

2013

2012

Blog Roll

Recent Comments

  1. John Morris commented on

    The Top Five Tips on...

    Thank you very good and a healthy...

  2. CJ commented on

    The Top Five Tips on...

    This is great information, although I...

  3. Pedro commented on

    Hydrate or Cry: Make...

    Is this a 6% drink like Gatorade? How...

Current Issue Outside Magazine

Subscribe and get a great deal! Two free Buyer's Guides plus a free GoLite Sport Bottle. Monthly delivery of Outside—your ultimate resource for today's active lifestyle. All that and big savings!

Free Newsletters

Dispatch This week's featured articles, reviews, and videos. Sent twice weekly.
News From the Field The most important breaking news from around the Web. Sent daily.
Gear of the Day The latest products, reviews, and editors' picks. Coming soon.
Outside Partners Outside-approved deals and special offers from select partners. Sent occasionally.

Ask a Question

Our gear experts await your outdoor-gear-related questions. Go ahead, ask them anything.

* We might edit your question for length or clarity. If it's not about gear, we'll just ignore it.