NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Great Wall of China. Satellite radar image of the Great Wall of China. This coloured image was obtained using 4 radar channels. The Great Wall is the orange line running from top to bottom. Vegetation appears red and water is black. The area within the white rectangle shows that the wall is comprised of two sections. Sections of wall built 600 years ago in the Ming dynasty appear as a bright, continuous orange line running from top to bottom. Older, Sui Dynasty, sections of wall appear as a broken white line immediately to the right of the Ming wall.
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