March 1, 2011
Shallow waters, changing tides and seabed instability create difficulties in nautical charting. A prime example is the Torres Strait, which separates Australia’s Cape York, Queensland, from Papua New Guinea. Linking the Coral Sea to the Arafura Sea, the Torres Strait is 160 kilometers wide with an average of 12–15 meters in depth. These shallow waters
February 25, 2011
By Katherine G., Steve H., and Seana M., imagery scientists in the Office of Sciences and Methodologies, National Geospatial-Intelligence Agency (www.nga.mil), Bethesda, Md. As rebuilding efforts and military operations continue in Iraq and Afghanistan, the demand for high-quality terrain data has increased steadily. To meet the demand, the National Geospatial-Intelligence Agency (NGA) has incorporated the
February 23, 2011
By Holli Riebeek, NASA’s Earth Observatory, Goddard Space Flight Center (www.nasa.gov/centers/goddard), Greenbelt, Md. Scheduled to fly for a year and designed to last a year and a half, NASA’s Earth-Observing-1 satellite (EO-1) celebrated its 10th anniversary on Nov. 21, 2010. During its decade in space, the satellite has accomplished far more than anyone dreamed. According
February 20, 2011
October 1st, 2000 The Dasht-e Kevir, or Great Salt Desert, is the largest desert in Iran. It is a primarily uninhabited wasteland, composed of mud and salt marshes covered with crusts of salt that protect the meager moisture from completely evaporating.
January 20, 2011
Snow cover highlights the calderas and volcanic cones that form the northern and southern ends of Onekotan Island, part of the Russian Federation in the western Pacific Ocean.