Reflected light maps Earth's vegetation

Using data collected by the VIIRS sensor aboard the Suomi NPP satellite, NOAA has created a map of the world's vegetation.

Though 75 percent of the planet is a relatively unchanging ocean of blue, the remaining 25 percent of Earth's surface is a dynamic green. NASA/NOAA
New satellite imagery from the NASA/NOAA Suomi NPP satellite shows the lush green vegetation covering our planet -- along with the changes in geography and climate as the landscape transitions into sparse growth and rock; or hot, dry, barren deserts.

The Visible and Infrared Imaging and Radiometer Suite (VIIRS) sensor, which is sensitive to different types of visible and near-infrared light, collected data from April 2012 through April 2013, allowing NOAA to create what it's calling a "vegetation index" identifying how much of the sun's energy is absorbed by plant life on Earth and how much is reflected back into space.

Plants absorb visible light to undergo photosynthesis, so when vegetation is lush, nearly all of the visible light is absorbed by the photosynthetic leaves, and much more near-infrared light is reflected back into space. However, for deserts and regions with sparse vegetation, the amount of both reflected visible and near-infrared light is relatively high.

Using this data and better understanding the changes in vegetation has many applications. From weather and ecological forecasting to land use policy, a detailed pixel-by-pixel analysis of changes in vegetation from week to week can have some surprising uses. NOAA says data like this can give early warnings of droughts, dangerous fire conditions, and even malaria outbreaks.

You can see the entire world's vegetation mapped here. And check out our slideshow below:

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About the author

James Martin is the staff photographer at CNET News, covering the geeks and gadgets of Silicon Valley. When he's not live-blogging the latest product launches from Apple, Google, or Facebook, James can be found exploring NASA, probing robotics labs, and getting behind-the-scenes with some of the Bay Area's most innovative thinkers.

 

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