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Global coral reef assessment built on NASA images

A first-of-its-kind survey of how well the world's coral reefs are being protected was made possible by a unique collection of NASA views from space.

A team of international researchers using NASA satellite images compiled an updated inventory of all "marine protected areas" containing coral reefs and compared it with the most detailed and comprehensive satellite inventory of coral reefs. The global satellite mapping effort is called the Millennium Coral Reef Mapping Project and was funded by NASA. The study was reported on recently in the journal Science.

The assessment found that less than two percent of coral reefs are within areas designated to limit human activities that can harm the reefs and the sea life living in and around them. Countries around the world have created these protected ocean and coastal zones where human activities such as shipping, fishing, recreation and scientific research are restricted to varying degrees.

"The contribution of NASA images to this project was crucial," says study lead author Camilo Mora, a marine biologist at Dalhousie University, Canada. "The satellite images allowed us to pinpoint where coral reefs are actually located within coastal marine ecosystems."

The Millennium Project collection of global satellite images of coral reefs was first released in 2003; maps derived from these images were released in 2004. The images are now publicly available from NASA's Goddard Space Flight Center, Greenbelt, Md. Landsat 7 was designed by NASA and launched in 1999. The Landsat Program is a series of Earth-observing satellite missions jointly managed by NASA and the Department of the Interior's U.S. Geological Survey.

To achieve detailed, worldwide views of the very small and widely scattered reefs, the Millennium Project team analyzed nearly 1700 images taken by the Landsat 7 spacecraft over four years. Computer processing of these data resulted in the coral reef inventory and map
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Contact: Rob Gutro
rgutro@pop900.gsfc.nasa.gov
301-286-4044
NASA/Goddard Space Flight Center
26-Jul-2006


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